Damn, Don...no faith in the peeps of DDR?
anyways...
Foxysandchick, you named just about everything that is the easiest and cheapest bang for your buck. I, personally, would stay away from the rev boxes. I am seen many problems with them. If you do end up getting one, keep the stock one under your seat in case that new rev box ever goes out. I'd just do a slip on pipe, K&N and outerwear & remove the airbox lid, and jet it to compensate and be done with it. Those bikes run pretty decent as long as you aren't a hill shooter. They are great in the dunes.