I'd upgrade your room acoustics so you can hear exactly how each piece of equipment really sounds, and how each piece makes a difference in your overall listening/ viewing experience. It is undoubtedly one of the last things folks pay attention to, but after they do, they are amazed how the quality of their listening experience increases. (some times dramatically)
Here is some good information on why acoustics and a properly tuned room are important, as well as some tutorials on how to DIY acoustic treatments on the cheap:
Home Theater Acoustics FAQ and Tutorials my 2cents
