I think there are some misunderstandings about image quality floating around here. A current 18MP rebel is going to make a "better" large print than a 12 MP 5Dc because it has a higher resolution. The difference is in the better low light ability of a larger sensor, the larger pixels, and the greater depth of field. I have both and use both. The 5Dc has a better noise characteristic at ISO 1600 than the rebel and it's fabulous for blowing out backgrounds. It doesn't take kindly to underexposure though. It also has a nicer Viewfinder (No one mentioned that).
That being said, the 5Dc feels like a clunky old camera and the T2i feels much more solid and is much more responsive.
Also, you don't need L lenses. That's some crapus. If it's your first dSLR the picture quality improvement with just about any lens is going to be amazing. The consumer primes do just fine on a full frame too, by the way. They're not as good as the L's but they're pretty close and if you don't know L, then you won't miss it. The Canon 50/1.4 and 85/1.8 both beat the corresponding L's in certain aspects, and beat them by a mile in terms of value.
I would recommend the rebel as a starter with a kit lens(there's a reason it comes that way), and then a fast 50 for low light and shallow depth of field. The 40/2.8 is pretty nice too. Oh and the 35/2.0 is great on a crop camera. $100, $200, $300 respecitively. All cheap(for a lens) and make nice photos.
Also, invest in Lightroom if you can. Post processing can make a big difference in final picture quality.