Well as far as bonuses I would have to say Full Tilt, there current bonus is 100% deposit match upto $600 with bonus code OPA600, some sites do offer bigger bonuses but offer less in alot of other areas than Full Tilt. If you would like to check out some of the offers at other sites though you can go to my site listed below, hope this helps, good luck.
The top three bonuses offered by well known sites -
Ultimate Bet offering 111% up to $1100
Doyles Room offering 110% up to $550
Full Tilt with 100% up to $600
Tkae a look here http://www.gamblingsafe.net/poker-bonus-...
where you can find the top 10 poker bonuses.
Some sites have offers of 2000$ bonus
100% bonus is fairly common. The best deal I've heard of is the refer a friend + bonus. I used this to get into Full Tilt. I deposited $100, and used my former employer as my reference. He got like $50 extra, I got $150 bonus.
Disclaimer - The Views Expressed In This Article Are Provided By A 3rd Party And May Not Match Those Of Our Website