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It might be worth going for an older full frame, which would be a 5D, EF lenses would work. The main difference with older cameras apart from resolution would be the interface and usability, focus tracking etc.. I think the 450D was the first low-end camera with Live view, around 2008, so worth checking if that's important for you.
Something newer but lower end would be a 60D or 100D, EF (and EF-S) lenses would work, it's a crop sensor (APS-C) camera. The 18MP crop sensor Canons are not renowned due to sensor noise at higher ISOs though. But if not bothered about high-ISO stuff, a modern low end would have live view and touch screen.
I'd like to experiment with a DSLR - I've been using a Sony compact but I'd like something with multiple lense choices and RAW support. I have a couple of lenses for my Canon EOS film camera, so ideally I'd get a Canon again.
If I have a budget of around £200, will I be able to pick up an older DSLR body and not be disappointed?