Upload & Sell: Off
The OP is of course referring to the Rebel XSi/450D.
I owned an XSi. Is there something it's not doing for you? Don't upgrade just for the sake of upgrading. Upgrade if you are limited by your current equipment in some way.
Shooting sports, I needed superior AF performance, more frames per second, and ISO above the XSi's limited 1600, so I upgraded to a 7D.
Yes, I am wondering if the equipment is limiting me, if I am missing out on things by not upgrading. With the naswers I am seeing it sounds like maybe I'm not being limited. I saw the great sale prices on Canon.com and started thinking!