My ex-contract employer Vicente Valtiery (Dark Brotherhood) has given me an offer to become a vampire like him.I have refused for now,but his offer allways stands.
Should i become a vamp?
What are the benefits,and what are the drawbacks?
Can i walk in daylight as a vamp?

And will my face change much (i'm Argonian)?

as for argonian vampires, not to sure about how it will affect your features. don't remember clearly if i ever saw one. my female dunmer looks HORRIBLE as a vampire. at least compared to beforehand, when she was young and pretty.

and as for powers/stat boosts...
vampirism has 4 "stages". you advance in stages as you go longer and longer without feeding. in the first stage you take no damage from sunlight, and have +5 added to certain charateristics and skills (Strength, Speed, Willpower, Acrobatics, Athletics, Destruction, Hand to Hand, Illusion, Mysticism, Sneak).
these additions go up by 5 points for each stage of vampirism, ending up in +20 in all of these skills/attributes

power at 25% vampirism is hunter's sight, which casts night-eye and detect life for 30 seconds.
at 50%, you gain vampire's seduction, which is a nice charm spell, and makes it so people will talk to you at 100% level
at 75%, you gain Reign of Terror, which casts Silence and Demoralize on your enemies.
and finally, at 100%, you recieve Embrace of Shadows, which casts invisibility for 3 minutes and night eye for a minute and a half.

note: at level 4 (100%), most people in the game won't talk to you at all unless you bribe, persuade, or charm them (i.e. vampire's seduction). wearing personality+ equipment helps this too.
when you feed, you go back to level 1 vampirism for a period of time. so if you absolutely have to walk in the day, feed that morning and you should be fine. note that you lose all stat boosts and such, effectively reducing your effectiveness. a decent trade off for being able to trade goods and talk to people who sleep without having to break in. and yes, you gradually get your powers back in time after feeding.

Sounds pretty good to me!
Just something to add:Do boost stats go over 100 limit?I mean:If i naturaly have 100 Sneak will my sneak be boosted to 120(at level 4) ?

Also is there any other way to feed exept people?I saw some Human Blood ''potions'' in Valtieryes chest.

Do people know i'm a vamp?I mean,do they freak out when they see me?Or they treat me like a normal person?

Can i remain in ''Order of Virtuos Blood''? It's a faction specialised in killing vamps.......What can i say:250 Gold per each Vamp Dust is awesome.

And the last one:Are there clans?Or just one type?

No, they lnow your a vampire at the 4th stage. I'm a vampire but I dont know how to remove the disease. It really sucks having to feed though. you have to sneak in and fedd on a person and I'm not sure if it kills them or not but, pretty soon the whole town is gonna be empty. Any help on reversing vampirism?? I dont like it anymore!!!

reversing vampirism, from what i've gleened from talking to people on the interweb and npc's in the game, is a fairly drawn out process, you have to find 1 person (in the mages guild complex near the imperial city, then go on a series of ingredient hunts. if you're higher level, you usually have most of them or know where to find them. (hint, nightshade, which i think you have to gather, is sold at the main ingredient in the market district.)

haven't done it yet myself, i'm using my increased strength to carry all of my goodies from my thieves guild bedroom to my new house in cheydinhal .

and yes, it does increase over max, from what i've seen. my speed is around 120-140, depending on what equipment i'm wearing. strength i haven't seen yet, because i didn't start really raising it until level 22 or so. markman rocks, therefore agility 100 took presidence (sp?). as for skills i'm pretty sure it goes over max too. but i haven't even looked at my base skill levels for a while, due to all the constant effect stuff i wear (and switch around often).

as for clans and vampire quests, i haven't really found any. from personal experiance, only 2 vampires don't attack on sight, both of which are named npc's who don't give you much information, if any at all, on the condition.

a note on feeding - you can also feed on people who are asleep, provided you can sneak well enough to break into their houses. i usually feed off of bums in the imperial city waterfront or from annoying quest givers that are rude (the orc fighter's guild fellow in cheydinhal is a personal favorite), also, i enjoy feeding off of blackwood company members. i haven't found that the human blood potions do anything about feeding. they act simply as fortify attribute potions. though my alchemy skill is low and i can only get the first effect, so i'm not 100% on that.

Cool!
Thank you very much!

From what i've seen there isn't any good reason not to become a Vamp.
Just one more question:Do other NPCs treat me like i Vamp or normal Argonian?Does my Vamp level govern how i look?For example:People don't know i'm a Vamp when i'm level 1,but they can tell when i'm level 4?

Yes, your appearance changes the longer you go without blood.
Check out thread on various (here and other sites') forums. Most won't talk to you if you go 3-4 days without blood. It will take a strong charm spell (which you get to use once a day as a vamp) to even get them to speak with you.

OK,thank you all!

That's all i wanted to know.

I have decided to become a Vamp and upgrade my Personality Attribute a LOT.....But it's worth it......