Fligi7 wrote in post #11547778
Well, I have the same 450D and I'm needing to make that move to the 7D for better ISO performance and fps. I'm sure you've considered this as well.
I started with a 40D, and I still use that as well as a 7D. The 7D has advantages both in Hi ISO performance over the 40D and the 80 per cent more pixels gives more cropping options. The 8fps vs 6fps isn't a huge advantage, but the AF options are. I use both cameras together with some combination of 85 f/1.8, 100 f/2, 135 f/2, and, if there is enough light, a Sigma 50-150 f/2.8 with the 7D on the FX event ( and sometimes the BB). UB and VT I use one of the primes.
I have only once been in a gym where I could use less than ISO 3200 and that place was a converted Wal-Mart re-engineered as an indoor sports complex.