Here's another vote for not being afraid to use your high ISO. I have a 7D, same sensor as your T2i, and I use 3200 all the time. Unless your printing larger than 8x10, then your fine. Get some noise removal software and your set. I used noise ninja when I had windows and wish they would update their processes for newer macs. I use topaz denoise and it works really well, just much slower. The other thing for slower shutter speeds with non-IS lenses is work on your technique. Always make sure your steady to get the best possible shots which means good stance, good posture, and good arm position. Read up on Joe McNally and his technique for taking photos at slow shutter speeds.