nice purchase.
in terms of performance (it depends on your priorities) i would recommend:
*quality tyres (and correct pressures): pirelli PZero, michelin pilot sport 2, bridgestone RE050, etc
*suspension: upgraded dampers (eg: KONI Sport or FSD, Bilstein B6) +/- springs (eg: Eibach Pro Kit), or coilovers
*drivetrain: Q2 differential
*brakes: braided brake lines, fresh brake fluid, upgraded pads
these are likely to yield the biggest tangible improvements. then you can finesse it from there: exhaust, chip, cosmetics, etc.