using pre-paid phone

Good morning everyone. I need some of your expert advice please.
I have been a Tmobile customer for about 4-5 years and here's the deal. I need a replacemnet phone, I am currently out of contract with them..but do not want to switch carriers. I like Tmobile!! I am not too impressed with their current phone line up compared to other carriers.
My question is-- can I purchase a prepaid phone to get by on until (maybe) newer phones come out to satisfy my (LG Shine) cravings? Just maybe something like the 2610, and can I use my SIM card or do I need the Start up kit? I would hate to extend my contract for a phone I dont like.

Thanks in advance for your advice and any suggestions you might have!!

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Thanks for your help.....just wasn't sure.