Try Revolution Network as they have really soft tables... a lot of US fish... There is not many a selection and can take time to fill up... but if you find yourself winning in Pokerstars.... you will here... But in all honesty for 9, 18, 45 man's.... Go with Merge.. I suggest Carbon poker
or Black Chip Poker... Black Chip Poker give you a starting bankroll of $25 if you sign up through YourPokerCash.com ...
Give it a try... its worth the shot,,, I am surprised no one else has commented to you! Now I do not know off US sites... Titan Poker
( also gives a free BR away) seemed to be good down the grapevine... and PokerTime gives a free $10 BR to get you started.... just search on google.com for No Deposit Bonus Free Bankrolls. It cannot hurt to try as you have the free money and get the feel of the site, etc.
Hope this helps,
P.S. 888 Poker
as well... just do not forget your Rakeback... 36% of Buy-In Fee's is a lot to get back.