Personally I would'nt buy a camera from BestBuy. It's a chain store, they just want to sell it to you and get you the hell out lol.
I use
Adorama.com and they have good prices. I recently just sold my XSi to a friend, and I have no idea why but I ordered the T1i on Tuesday night. I got the camera, 18-55mm, 16GB memory card and a lens polarizer for $680 to my door. Granted, I got a Refurbished model... it's about $70bucks less than a new one. But IMO it's better, considering someone will be going through the camera to make sure everything checks out perfectly before I get it. I could get that 250mm BestBuy has in the deal refurbished for about $200, so I can still make off cheaper than you. I could even buy another case (already have one from my XSi) and still only spend about $910bucks!