Hi.

I'm almost convinced myself to buy a Canon 600D, I want to wait for the 650D. But I can see it taking a while with no announcments as of yet, and even when it does get announced it proably wont be out for a month or two after that.

I've basically got around £900 to spend on body and lenses. I can probably squeeze out of that the 600D with kit lense, Tokina 11-16mm f/2.8 and the 50mm 1.8. I'll be using it to film extreme sports such as power kiting and mountain biking, so will all be outdoor meaning light isnt really a problem.

My only concern is the kit lens, will this be OK as a general use lense for filming? I'd use the Tokina mainly for the action shots as the kiters jump over me and the 50mm for DOF shots.

I would look into replacing the kit lens with a 28/35mm prime but image stabalisation is pretty important for me being handheld most of the time!

The 600D is an awesome camera for the price. The image quality is the same as a 7D and simply blows away many camcorders in the same price bracket.

I have had mine for 8 months and love the video quality, and I recommend adding the Magic Lantern hack.

Your budget is low, so you may not have an option.
You'd be okay since you're shooting outdoors in good light; setting the f to the high side so it doesn't change as you zoom in/out, if you zoom at all.
Other things to consider/research: DIY or secondhand stabilizer, rig, monopod.
Best of luck to ya.

And secondhand lenses.
Don't forget does not always have to be EOS mounts as you an also use adaptor. eg. I have two Oympus lenses bought dirt cheap.