Don't bother with SLI. It's a complete waste unless you have pointless money to blow. Get a socket 939 motherboard with a PCI-Express video card slot. Don't get AGP. Then get a 6600GT PCI-E, or X800 XL PCI-E. Those are the 2 best deals as far as PCI-E cards go. And I don't want anybody to argue that. Good choice of RAM. But for your hard drive I wouldn't get one 160GB.
I would get two of these and put them in RAID 0 because they will offer you the same storage space but will be MUCH faster than a single drive.
And if you really want a video card cooler, then I would recommend this as it looks very nice.
I'm not sure about your CPU cooler either, this here is one of the top-of-the-line COMPLETELY silent CPU coolers (even at full speed I can't hear it, and the rest of my case fans are 21dba so it's very quiet)
Make sure to get some Arctic Silver 5 Thermal Compound as well. Took my temps down about 6C or so.
Would also recommend a better power supply, here is one of the best:
Lastly, I hate wireless keyboards and mice, but your call on that.