I ordered a Retina this past Tuesday, and cancelled my order today and opted for the 2.6GHz, 1GB GT 650M, Hi-Res Antiglare MBP.
I ordered with the standard 8GB of RAM and 5400 RPM 750GB HDD. I figured with the prices of RAM and SDD's dropping, in a year or two they'll be even cheaper for me to upgrade.
I had a tough decision deciding between the two. I'm sure the RMBP is a great machine, and will be even better once any issues that have/will come up are resolved. I am really looking forward, as are others that have posted above, to see prices of SDD's drop, and to replace the boot drive, and maybe even the optical drive with SDD's.
This forum really helped with my decision, and has also been very informative!