Speedlights and a softbox, otherwise just wait.
I just had my t2i serviced after the Af went wacko. Back up to its great quality again.
7d- better (awesome!!!!!!!!)body, worse image
6d- terrible AF point spread, especially for people. Great for mountains though
5d3- awesome, expensive as %$#@
60d- better controls, frame rate, pics, not really, super old tech not worth side side-grading to
If you really need a new body, i say go for the t4i. the tweaked sensor has awesome sharpness, with the expense of higher noise. Keep it in low isos and you are good money. The all cross af points work great. then there's the touch/swivel screen. + the optical flash controls.
until ther3's a new crop body, i cant upgrade unless someone wants to pass me their 5d3 for 2k
I feel your plight