Xmas day is looming and in about 30days time I'll be getting my Xmas bonus. Cleared it with the wife and e lot can go on the car

I'm getting between £1500-£2000 question is what route so you lot think I should take. The car is standard and I've already detangoed and put a cat back exhaust on. Been on a dyno. And she is very healthy putting out 15 more bhp then she should as a standard car. And ideas would be very helpful