That sucks. John, the owner of Import Perf. Transmissions told me the 2nd gen 7 spd is not a strong transmission. On the flip side, he rebuilds many different import transmissions. If you need it be built to hold more power, try IPT and if not, try a local reputable shop if one exists. You can always go the used route instead.
Before you go and rebuild or replace the thing, make sure it's not something to do with the valve body.