You seem fine with 128GB so I wouldn't worry. Adobe aftereffects would work better with 8GB of RAM though.
My opinion, the Retina screen + Pro package is worth it. In most activities, you won't notice the difference in processing power. The Pro will edge out the Air, but not in a worth while way. In terms of general use, the Retina screen uses up the additional graphics power so it levels out. The Pro is more flexible because you have 2 thunderbolt ports for two monitors if that ever came up. The display would be better for graphical work and personally, I work with text and numbers all day and the retina screen is really nice. That being said, I usually use mine in clamshell mode with external monitors.
It's really a tough call that only you can make. Either one isn't a bad choice. I think your decision of 8GB is good. Not necessary for an enjoyable experience most of the time, but definitely helpful for adobe apps and the future. I would save up for the Pro myself.
Pro:
Box form-factor (which I prefer) - it actually has a smaller overall footprint than the Air
More ports
Better screen
Air:
0.5 pound ligher
3-4 hours of additional battery life.
Definitely cheaper so you could pocket the left over money or get a nice external display.
For what it's worth (and it may be irrelevant to you) I can get a good 9 hours out of my 15" rMBP and the 13" should fare better, but that's entirely dependent upon you usage. One interesting thing I have noticed at my university is that there has been a shift in seeing 13" MBAs to 13" rMBPs. I only see one student now with a MBA. One thing that's nice about the Pro is dynamic desktop space. You can scale up your display to 1440 x 900 or even higher with third party utilities. That is of great use when I'm on the go and need more room for documents.
I apologize for being long winded.
EDIT: one comment on the Air. Thought I still say the display isn't terrible there is one thing that may be annoying to you. Because it isn't IPS, you need to view it straight on. The attached screenshot is from
this video review of the rMB (the video will start at the part where she discussed screens). Notice how the colors and contrast suffers when they close the display and you aren't looking at it straight on. I think the Air is a fine device and you'd be happy with it, but it is another consideration.