well, if your looking for performance, well, it comes down to budget...
a performance exhaust system is always a good start, and you can couple that with an induction kit.
Then you might want to consider a piggy-back ECU - just to maximise the effect of the mods by controlling the air and fuelling...
Of course, the best way forward is a supercharger. TTE (toyota Team Europe) have one available, and will increase the power to around 225bhp...
For handling, lowering springs and struct braces will help lots, and make it feel much stiffer and more stable, but for maximum handling, go for coilovers...
hoep this helps...