I am about to take the leap and finally upgrade my beloved and trusty 40D after 4 years. I won't buy a 50D (not really an upgrade) or a 60D (weird plastic super rebel). I buy used for several reasons - it's cheaper, I get to wait and see if the hot new products live up to the hype or not, and I'm a bit anti-consumerism. But I do love my cameras. I shoot mostly action (wildlife, some sports every now and again) and a bit of landscape as well as long-exposure night photography. I have a lot of 'uses' covered by my EOS-3 and by MF film gear, so thinking mostly about action and ISO performance, things that don't play nice with film. With that in mind, would you buy with a ~$1200 budget:
1) Used 1D Mark III (yeah, submirror AF blah blah)
2) Used 5D Mark II
3) Used 7D
4) Stretch and buy a 6D (a little against my grain, but...)
5) Something else?
I have a good handful of L glass to cover ranges in different sensor sizes (and I'm obviously used to APS-C with my 40D) so I'm not too worried about APS-C vs. APS-H vs. full frame.
I'd greatly appreciate any inputs, flames, thoughts, criticisms, or rants. Thanks.