I have used both a non-retina and retina 15" computers (my non-retina had the high-quality display), and there was a difference. But, depending on what you are using it for, I would go with a Retina. But I would wait, because I think new models with the Haswell processors with better graphics, better battery life, and faster processors will be coming soon. The MBPwR is Apple's favorite computer right now, so of course they are going to upgrade it more then other models.

1 thing, UPGRADE YOUR RAM if you go Retina. Since the Apple Store replaced my non-Retina with the Retina for $100, so I got no say in the RAM and I'm stuck, forever, with 8GB of RAM since it is soldered. The Flash Drive can be upgraded, but It will void your warranty.

I think Apple is going to start phasing out the non-Retina, and the MBP will only come in Retina.