Some people don't like the flash start up screen from another carrier. I say who cares. I rarely ever see the start up screen, except on the occasional reboot.
txstuntman, if you buy off Ebay, read this and follow the suggestions. There are some good deals for BBs on Ebay, and there is a bunch of crap that you can have continuous problems with--if you don't ask the right questions first. Buying a BlackBerry off eBay - BlackBerryFAQ
Good luck, and welcome to the Forums.