Which phone should I get?

My carrier is tmobile, I currently have the samsung comeback but the hinge to open the phone isn't working properly (it's not as smooth an opening as it used to be before a bit broke off) and I spilled perfume on it so Im getting a new phone as a birthday gift because my birthday is in April anyway:P I've had it since last June. I was looking at the samsung Galaxy SII and it's a really good phone, and a fierce competitor to the iPhone (which I can't have because it doesn't come with tmobile :( ) but recently I've heard there's going to be a Galaxy SIII coming out in April atau sometime sooner atau later, hopefully sooner? Should I get the SII atau wait until the SIII comes out? Also any reviews of the Galaxy SII for tmobile would be nice(: thank y'all soo much