Why not an xr? I havent done much research but stock they weigh around 2900lbs. Which isnt bad, thats FULLY loaded as well, remove all that bs and Im sure you can get it down to around 2500. IE leather seats, rear seats, Im sure there is a lot of noise padding as well.
If Im correct the xr has IRS? I like that idea, im not going for a balls out 1/4 car, I would like to run low 13's but Im looking for a VERY streetable car, since thats where I drive it the most.
Moving to a foxbody, Im a little shaky about that. I want something diffrent, granted diffrent comes with a price whether that be time or money, I think im willing to sacrifice (our love). I found a good deal on an 84 Foxbody, but its carb'd, Going from carb'd to EFI is a pain in the ass, however I will be doing a completle swap of the fuel system anyway. IE: fuel lines, injectors, fuel rail etc.
My two favorite choices right now are the xr or a Pinto, the XR all I have to do is go pick it up. The Pinto I have to dig for, but I think a Pinto would be worth it.