I’ve tested the 5D MK II, the GH1, the D90, the D300s and the 7D. I really liked the GH1 but the codec was a pain to edit. The 7D ended up being my choice. It’s relatively inexpensive and I used it with everything from a Canon 50 F/1.4 to a Canon 800 F/5.6 and got great results. All these cameras suffer from rolling shutter. All have their quirks, but so far, the 7D seems to be the best choice for me. I own two of then. I’ll be testing the Canon 1D MK IV next week.