Basic Unlocked GSM Phone

[Blinkme323]

I'm in need a of an unlocked phone I can use on T-Mobile. I only use my phone for calls and texts, everything else is unnecessary for me. I care about durability, thinness, battery life, call volume, and cell reception. The simpler the interface the better. I used to have a Razr V3 which was perfectly fine.

My budget is about $50-75. Looking on Ebay, the Krzr K1 and SLVR L7 caught my eye, but I'm certainly no expert with this stuff. Any recommendations?