I currently have a point and shoot camera. However, I recently had a strong desire to purchase a SLR. I have been recommended the Canon XT but don't know if it would be better to get the XTi, or even go above that and get the 30D or 40D. Pricing I have found is as follows: XTi (body only)- $319 30D (body only) - $459 40D (body only) - $549 Is it worth the extra money? I am planning on purchasing the Canon 28-135mm f/3.5-5.6 IS Image Stabilizer USM Lens to go along with the camera I get. Any suggestions would be greatly appreciated. Thanks so much.