Spending $2000 on Audio, wheels, and suspension mods is stupid.
If you're after a project/performance car I'd start reading up on turbo's and then decide how deep your pockets are
For your first quoted point, mine has a full sound system w/ sub and amp, and 17" VY SS rims. Not sure how much in total that would equate to, but a nice set of rims and a polish goes a long way on a neat looking VL. Although mine wasn't exactly a dunga to begin with I suppose. Not a stab at you BTW mate.
But yeah as monkeys has said about going project/performance, if you want to go the full turbo conversion (turbo, injectors, ecu, gearbox, diff) expect to put in some overtime. Not that it matters, mine's still going strong, Nath's is going strong and ours are NA to Turbo conversions but if it's gonna be a "performance" car you'd want to fork out the extra cash for the turbo gearbox, ECU, bigger injectors, full 3" exhaust, and of course a turbo (standard or high mount). There's a lot to think about if you are willing to spend the time and money on it