We are good at spending your money! We just like to see you get the most benefit to your system, in your space when we do.
How big is your space?
What do you like to do with your system, is it just music?
Since you don't mention a subwoofer, many here have already suggested that may be the thing your sustem is lacking the most. Your Pioneer doesn't have a specific pre-amp output for a subwoofer, so I'll leave to the experts to dissect the best way to integrate one. Which you choose depends upon what kind of music you listen to, how loud you like it, the size of your room, and your budget for one.