Yeah, a S2K would be great but, dude might not have 12K for an SK2. Since dude mention that about a RS w/ evo turbo. The turbo is good but an RS was some garbage. I had a 90 GSX loved it.
Another car you and your dad can look for not as light but great starting point. DC2 GSR 94-97. Already have a B18C1 170hp. You won't have to do a swap. You can build it up some. Of course it'll be a little heavier than a EF or EG hatch. You can find a good stock 94-95 for maybe 3-4 K. Also check out a auction.