I still think cMBP is still a great computer, the build quality is superb and stood its test of time. I know things are moving towards rMBP but I still like cMBP more.
Even if I had the money to buy retina, I'd get the classic - it's just more serviceable. I don't have anything "retina" at home except iPhone 4S so I guess I don't feel like I'm missing out on something.
To me, cMBP seems simply like a better value. I know I'll probably think differently 2-3 years from now on when laptops like rMBP will be becoming the norm.
Also, rMBP, the one that came out in July 2012 is a first gen. I wouldn't want to be a guinea pig, there are some issues with it being the new design. I bet when the new one is announced, it'll be better so at least I'd wait till WWDC with the purchase.