Hey there everybody, I'm new here, so bear with me a bit

I dont have a cell phone, or a provider, nor have I ever had one.
I dont want a contract, as I am a student and probably couldn't afford to be locked into something for 2 years. I'm looking for something thats 20-35ish a month.. I really like the idea of MetroPCS, it was just added in my area. I really dont like their phone selection though.. I've heard of people buying newer phones and having metro convert it, or unlock it, or something.. like buying a Razr from ebay, and then having it work on MetroPCS.
I'm not really set on a phone service yet, or a phone.. but I'd like a camera phone. Maybe one of you vets could help me out in this area, here's what I'm looking for:
Camera Phone
Cheap Service without being locked into a plan
And if I was to go with MetroPCS, what kind of phone should I look for if I was to buy it used?
CDMA,
GSM? I'm kind of a newb, so don't burn me to bad for this post :P
Thanks a ton,
-Havocbean