Yeah dude, if you've got the 1.8T, do the chip. It's the biggest "bolt on" mod for the car besides a turbo back exhaust, but I don't think you'll get that for under $800. Also, when you get a chip, make sure you replace your DV. The stock ones can't hold the amount of boost that the chip will push.
i say get a apr chip. and a exahust for your 800 and if you have like 50 bucks left over get a K&N drop in. those 3 mods are the first things you should do. then suspension. Or you can get the suspension and the chip and the K&N. the possiblities are endless!!! well not really but you got some choices
well what engine did you get? if it's the 1.8t you could get a chip or a BCS, exhaust, a new d/v, and little left over for a spoiler or some little interior stuff. but if you got the VR6 i would say suspension and exhaust.