Switch to AT&T via amazon.com
I recommend this because it will allow you to use a GSM phone and you will get paid at least $100 to switch carriers. Every time my contract is up I will switch from AT&T to T-Mobile and vice-versa. Since I use an unlocked GSM phone that will work on any GSM network I get the fat amazon rebate and whatever cash the free phone sells for on eBay. Usually about $200 bucks.
And if you travel overseas you can still use your GSm phone.