Thanks for the post. I'm debating this too, and as it seems like "champagne problem" to have, this will be first new computer for me in 10 years. Yes, I had some help from a tech guru friend of mine to rebuild an old Dell. But that's another story...
What strikes me as problematic: If Apple is releasing the MBP RD now; and also releasing the standard MacBook Pro, Apple seems to ask consumers to decide, as Kyle Wiens aptly suggests:
http://ifixit.org/2763/the-new-macbook-pro-unfixable-unhackable-untenable/
Primarily what bothers me is: Apple's deliberately chosen a product development method that anti-environmental. Wiens refers to this as "Planned obsolescence" similar to the autor industry. He's right.
However, it all depends on your use of the machine, what your primary apps are, and what RAM you need to support those needs.
I will be using CS6 constantly (PShop, Illustrator, InDesign) for illustration and design. But I'd also like to be able to venture into video, since I have a Nikon D90 that will work well. (Believe it or not I like to have the flexibility to work from hand-drawn images, process them as digital images, and then outputting them again as digital images.)
Where I'm stuck is: Will that 4x of pixel density really make a difference to my work?
*The next best solution is the MBP Standard with high-res upgrade 1680-by-1050, SSD, and 16GB RAM--and it's upgradeable and fixable.
The latter point may seem unnecessary. But, say I'm traveling, doing a workshop abroad in Europe, and no one can repair my machine--not even me-- so I must wait two weeks minimum to expect it back. I would likely pay through the nose for repair. This scenario most likely would occur within days of the expiration of AppleCare. Then what worth is my MBP with Retina Display? Then what worth is the approx. 1 lb. less (4.46 lbs) of laptop?
Thoughts?