I got a Retina MBP earlier this year but due to a snafu with the Apple financing I had to send it back. Long story short 18months no interest was US only in Canda the deal is full payment in 3 months. So I'm using my Mid 2010 Unibody it's been upgraded with max RAM and an SSD. My cousin is looking for a new laptop and says he'll give me $1200 for my MBP. So I could go get a Retina from Bestbuy for $2400 but I'm not sure I really want to take on the $1200 in debt. My wife and I own a house we are about to do our roof and windows which altogether is going to run us $7K with our hookups. But damn I'm missing the Retina and I don't know if I can walk about from this lol oh decisions decisions.
I wouldn't buy a computer right now simply because there are some new models right around the corner, so I would certainly hold off for the time being.
That said, since you've already owned the retina model before, you kind of know what you are buying into. I wasn't overly impressed with the retina model vs. my built MBP when I got it...the screen was incredible, there was no comparison there, but when it got down to it...I felt the fact that I was downgrading on almost everything internally was not worth it to keep the screen, and I never felt the weight of the machine was any better than my older model (even if it was a smaller chassis).
With the newer models coming, what is really drawing me back into the market is the battery life...something that I have found quite important lately when I don't have access to running my machine off the AC adaptor. Right now, I'm getting 3-4 solid hours of usage out of my MBP...not great, but not impressive either. The new ones are rumored to be in the Air's range, and that REALLY gets me excited. If I could have a MBP with 10+ hours of battery life, I'd throw internal flexibility aside and focus on that!