From the photos provided, it does look like the fork is bent. But it's hard to tell from photos a lot of the time.

What would be your plans for the bike, that would definitely make a difference in any recommendation I was to make.

Most REI bikes are fine riders. That being said, if you can get it for a price that would allow you to make repairs, and still be under the going street rate/value of the bike, you could be okay.

RSX is a popular group, so if the frame and fork were totaled, you could easily get your money back out if you paid no more than $100 for it like some other poster/s have suggested offering. If the fork and frame were bent, I probably would not offer even that much. If the group was in good physical condition (despite the shifting problem) I'f still make an offer, based on planning to use the bike as a donor.

If the fork is bent, you could also replace the fork. You use the bike as a rider. I don't see any problem with replacing the fork if necessary. Lost of people upgrade forks, and I don't see people urging them not to. Of the frame is good and the fork is bent, just replace the fork.

The shiftng problem could be the brifters, the derailleurs, the cables, or a simple adjustment or cleaning. Once again, if you buy at the right price, you can afford to experiment. The Shimano 7 and 8-speed brifters with metal bodies are repairable, and there are people on eBay who will repair broken brifters for as low as $35 each, or $60-$70 a pair.