I've never worked with them myself, but I'm led to believe that you can't go wrong with and LS swap. That's actually one of the more popular Fiero swaps so I've read into it a little. I agree, I hate electronics. The little Japanese cars from the 90s are so reliable and fuel efficient that I put up with the computers but I really prefer the car to "think" as little as possible. Can't argue with the results from a fuel injector though.
That's where I'm going with the Fiero. I swapped an overbored, high compression 460 into my Montego to be my big, loud, gas guzzling hotrod, but the Fiero has to stay mild enough to drive the 45 minutes to work everyday and go just fast enough to have fun doing it.