Canon is supposedly coming out with a new camera soon, so you may even wait and see what that is, because if that is too pricey, the cost for the older models may drop a bit. And yes, a 600d or 550d would be fine, but know that those have less controls than a 5d/7d. Like with any video camera... the less control options given, the less the price. The more you can control yourself, the more things cost. That is a big difference between consumer, prosumer & professional. 550d & 600d are technically consumer/prosumer cameras. The 5dmk2 is considered a professional camera. Does that make sense? The 5d has one big difference from all the other canon dslrs... the chip is a full sensor, and the other Canons have a cropped sensor. This means that every lens you put on a 5d, will have the accurate mm length without doing any math. ie - a 50mm = 50mm. With the cropped sensor on Canons, it is a x1.6 sensor. This mean that you must multiply every lens length that you want to use by 1.6, to get an accurate portrayal of your lens length. ie - a 50mm = 80mm. Sometimes this can be frustrating because you would need to buy a 24-30mm lens to have a standard lens. Which you may know, will cost much more that a straight 50mm lens. Its a give and take. I wish that I had 60fps, but I only shoot up to 30fps because of the sensor size. Hope that helps a little.