I've had my 7D about 18 months now, I'd still consider buying it again if I were purchasing something new now.
Timing-wise:
- The 7D2 may or may not be out by the end of this year. Don't expect one in your hand until at least January even if they do announce it this year. Also expect it to either be unavailable (if it's a decent upgrade) or not much of an upgrade to the 7D, and probably expensive either way.
- the 650D is just starting to be rumoured now, probably with the same sensor again, probably not in shops before August at least.
- The more you wait, the cheaper things will get, is there a regular mid-year sale in the UK?
- Specs-wise:
- I do a lot of MF on my 7D (like FL 55mm f/1.2). I just bought a KatzEye screen for it, which wasn't too hard to replace despite their warnings.
- Also consider the 60D for this. You can also get a KatzEye screen, apparently it should be even easier to replace. The 60D has the Pentaprism, 550/600D only have pentamirror, so darker and crappier viewfinders.
- Live-view MF is easy enough on the 7D. I know it looks gimmicky and I don't like it, but there are times I could really use that flip-screen on the 60D.
- Competition-wise:
- I hate to say it, but the Pentax K-5 has a lot of things that the 7D should have had included, for a 60D price. Including weather-sealed 18-55 kit lens, which doesn't work too badly.
- But you don't get to use Canon's great range of lenses, which is reason enough to stick with the Red camp.