Which room to put my cash on?

I won a nice freeroll and took down $300 in winnings. I'm going to keep $150 and put $150 up on one room. I'm pretty much decided on either Fult Tilt or Pokerstars, but could have my mind changed if a strong case was made. I really shine in MTTs and Pokerstars appears to offer the most in MTTs, so I'm kind of leaning that way, but again I'm open to reason. I will be playing some ring games and SNGs, but my focus will be low buy in tourneys, sats, and guarantees. Although I am not fond of R&As, because of the maniac play during the R&A period, I realize that my bankroll won't afford much more, since I'll be using the 2% - and no more than 5% BRM.

I've heard that Pokerstars is difficult to make a deposit on. Need some input on the easiest way to do it, and please, only answer if you have successfully deposited from the USA.

Eventually, I hope to deposit on several rooms as my bankroll grows.