5Dc is what i did to upgrade from a T2i. I use it much more than the T2i now. It performs better in low light and has a better noise characteristic at iso 1600. It takes less kindly to underexposure than the T2i. Got a pretty beat up copy for about $650. It has worked just fine (knocking on wood). Image quality is great. I recommend it. Keep the other one though, if you can afford to. It's comparatively light and small and is easier to throw in a bag and carry along when you don't feel like lugging around the clunker.
Thanks so much for this info man, this is what I was looking for How sharp are the photos compared to your T2i though? I've seen the IQ from the T2i, and it's impressive for such an inexpensive camera.
5D2 price isn't that much more than 1DS2. Then again, it entirely depends on what you want. If what you're after is better IQ and low-light performance, then by all means go for 5D2. 5D2 is better than 1DS2 when it comes to that. I myself also wants either a 5D2 or 6D more than a 1DS2. I'll just wait next year at least until end of March before deciding what to purchase. At least by then we'll know what's worth buying. 6D and 5D2 might have gone down in price by that time. For now, I'll just stick to 500D. Mine is also gripped. I find it hard to use if it's not gripped especially when I'm using my 100mm. If I buy 6D, for sure it will be gripped.
I agree with you, that 6D is really mouth-watering (for an APS-C user) but it's just too bad it's extermely over my budget. WOO! 500D club! I gripped my because I did potraits for my Video productions class, and having a battery grip also helped for stability in my low light shots. I take it off when I'm just going out with my girlfriend, but it stays on most of the time.