Hmm, if parts the only thing I could possibly see is a second 9800?
Mod type stuff...do you have a dremel? You could add cable management to the management challenged A900 you have. While you were at that some sandpaper and spray paint for the fugly interior they come with as well.
Yes I'm allowed to knock on them, I had an A900 for a year, wasn't too thrilled with it as you can tell haha.
Maybe a flashy cooler for your gpu. I don't know much about water cooling, but I don't think I'd personally start investing in parts till I was able to buy the whole set up, granted you're getting pretty close to doing that with $200.
As a whole though you have a very solid rig.
Mod type stuff...do you have a dremel? You could add cable management to the management challenged A900 you have. While you were at that some sandpaper and spray paint for the fugly interior they come with as well.

Maybe a flashy cooler for your gpu. I don't know much about water cooling, but I don't think I'd personally start investing in parts till I was able to buy the whole set up, granted you're getting pretty close to doing that with $200.
As a whole though you have a very solid rig.