Replying to Tmobile cell phones

So the time has come to buy a new cell phone, my other one broke today. I have Tmobile and will be buying a phone off ebay since I have no upgrades or anything right now. Ive had sidekicks and didn't like them at all. Im looking for a nice phone, but also one that is durable. Other then sidekicks I haven't tried to many so I am hoping you guys can help me out. I am selling my brand new octolands for this phone so I want to pick a good one. I was thinking of a few
G1
Shadow
some type of Blackberry?
Does anyone else have any that they really like? thanks in advance for any advice and plus K to anyone who helps