Noob with good stuff needs help

Jesus Christ you must have a lot of money, why did you go for four gigs of RAM? I woulda just got one gig and spent the rest on a second graphics card for SLI, having over 1gig of RAM hardly makes any difference in games See here. Same goes for the dual core CPU, very few games can take advantage of a second CPU.
On the subject of RAID, dont worry too much about that you wont need it (and would need to buy a second 300gig hard drive to use it).

Overclocking should be easy enough, go into BIOS at startup and there should be some overclocking options. Each BIOS is different and I dont own your board so I cant be much more help. Have a look in the manual it will tell you what each of the BIOS options does. I believe Nvidia provides on the fly overclocking software that allows you to easily over clock from windows.

When overclocking the FSB do it in small (=<5MHZ increments) then use a program such as prime95 to test for stability. If it crashes then lower the FSB a little bit.

Take it slow and easy, learn as you go...search overclocking how to using google and read...by the time it sinks in, and in small steps, your rig will fly from day 1!