Vitara pistons WILL work. You can get them from FJT on turbod16.com, d-series.org, or on honda-tech.

Pistons alone will run you around $120/shipped. While a bottom end package will go for about $240/shipped. That includes a headgasket, main bearings, rod bearings, pistons, wrist clips, rings, etc.

Get some tuner toy or eagle rods with these pistons and you got a good setup. A lot of people are weary of these pistons since they aren't forged but I have researched the shit out of the topic and have heard NO HORROR STORIES.

Get a good tune, and you'll be good to go.

And what're your power goals?