I reckon some LED sidelights that change from red, to green and then to blue.
Some Wolfrace wheels.
Rage Universal back box's sound awesome.
Dont worry about buying a full suspension kit, i got a mate to cut the springs and heat them on mine, so they're safe... And before everyone has a go, he done mechanics at college for a year, so he knows what he is doing.
I'd also say some bucket seats, or if not you can buy covers which make the standard seats like bucket seats, i had these on mine, but my mate spilt his can of stella on the passenger one, so they're out at the moment.
Hope this helps.
Jamie.