May I as the site admin wish you a very warm welcome to TorqueCars. It is really nice to meet you and I hope you'll be spending some time with us over the months to come.
You'll find us one of the friendliest and most helpful car tuning forums around.
I think a remap is the most cost effective map, get the gearbox mapped as well for a very zippy nippy ride. Smaller engines are actually stronger than larger ones and can cope with the power gains more easily.
Turbo upgrades also give large power gains and I've seen an MR2 engine powered Smart which literally flew, lifting the front wheels on acceleration!