i would go the LT-10s, it is the newer model from microtech. it would mean that you can run sequential injection, and direct fire ignition if you want (coil on plug).
with the LT-10s, you don't HAVE to get one that suits the 4g63.... your tuner can send them back to microtech to be re-flashed to suit it. only thing is you will have to re-wire the loom to suit the car/engine (or buy a new loom and wire in).
PS. i used to have an LT-10s that i picked up second hand for $500. no real complaints about it