Great quote comes to mind: "The best time to buy a new digital camera is when it's NEW."
I wouldn't buy a 60D, T4i, or 7D today. They will all be replaced soon.
Wait or buy a 6D, 5DIII, 1Dx etc.
I would consider buying a 7D if the price on new units falls well below $1000. It might, it might not. I'll probably just buy a 6D by late summer, and keep my 50D (its noise isn't that much worse than the 7D, and the AF is way more usable than all the unfairly negative criticism would appear). But I want the 6D/24-105 combo for the "nice price", which hasn't quite happened yet. It's been close once, supposedly. However, if I start seeing used 6D's going for $1150 and below, then I think I'll just spend more and get a new 5D3/24-105 instead. The only used 6D's on amazon so far, are listed the same as the new price...or else within $100 of the new price (~1700-$1850). Of course it's only been out three months. I am more price conscious than many on here, mostly because I don't make $10k a week from doing photography.