Well best way to spend 2G, hmmmm, you could always send it to me :lol: . Just kidding, but seriously, if I were to spend $2K, it would depend on what was already done to the car. If stock, I would start with a nice intake, a good set of headers, A lightened flywheel, A test pipe or high flow cat, a nice QUIET exhaust, and some HIDs (always nice to be able to see where you are going in such a hurry). It depends on where your priorities lie, and what your future plans are for the car. If you plan to go turbo, obviously you would go a totaly different route, but if you plan to go all motor, you're better off starting with the basics, this way, it'll give you an idea as to how you want to go about building your motor, and if you ever plan to do more.
The stuff I listed is simple, and can always be put back to stock if you ever run into any issues. Most, if not all of it, depending on how mechanically inclined you are can be done in your driveway with a metric socket and open ended wrench set (I'd pay someone to do the flywheel if you can, not worth the hassle to save the money, trust me!!!!).
Let me know what you are looking to accomplish, and I can answer your question far better!!!
Later,
Aj