Need Recommendations for My Setup

I have recently built a desktop over christmas and I just wanted to know what else I could do to the system to get the most out of it, whether the addition is big or small doesn't matter. I'll list by build below:

M5A99X EVO Socket AM3+ 990X ATX AMD Motherboard
FX 4100 Black Edition 3.6GHz Quad-Core Socket AM3+ Boxed Processor
AMD Radeon HD 6870 1024MB GDDR5 PCIe 2.1 x16 Video Card
Seagate Barracuda 1TB 7,200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive
16GB RAM (Obviously mobo compatible)
Corsair Gaming Series 800 Watt High Performance ATX Power Supply
NZXT Lexa S (Case)
23.6" SyncMaster LCD Monitor
Razer Lychosis Mirror -- Keyboard
Razer Naga Molten -- Mouse
Sony - BRAVIA 1000W 5.1-Ch. DVD Home Theater System

Any suggestions are helpful Thanks

Add another 6870. You'll be able to get a bunch more FPS outta it!

If you want, you can change to a Sandy Bridge based machine. That'll be pricey, though.

@striker410
Yeah, I was thinking about doing that and possibly getting a second of the same monitor. How hard is it to crossfire video cards? Also, what exactly is a Sandy Bridge based machine?

@ebalong
I've looked at these, they are fairly expensive if you want to get a large-sized one. I may get one in the future but not too soon. Thanks for the suggestion though.

Get a sound card that encodes in-game surround sound for the optical input on the Sony. Right now you're getting God knows what through there when you game, but it ain't what the programmers wrote---probably some kind of simulated 5.1 or even plain stereo. The card would need to have Dolby Digital Live (DDL) or DTS Connect. PCI or PCIe doesn't matter. It's a crying shame to not game in full surround when you're already hooked up to a home theater speaker system.

Don't get Creative; I could go into it, but don't get me started. They are overpriced and bloated, to say no more.