Thanks a ton for all the configuration advice - this is the system I ordered:

CPU: Intel(R) Core(TM) i7-920 2.66 GHz 8M L3 Cache
CD: LG 20X DVD+/-R/+/-RW + CD-R/RW DRIVE DUAL LAYER (SILVER COLOR [+7])
FAN: Thermaltake V1 Gaming CPU Cooling Fan (Excellent Overclocking + Silent Proof + Smart CPU & System Thermal Monitor)
HDD: Single Hard Drive (500GB SATA-II 3.0Gb/s 16MB Cache 7200RPM HDD)
HDD2: 64 GB Ritek RiDATA 2.5 inch SATA Gaming MLC Solid State Disk (Nearly Instant Data Access Technology)
MOTHERBOARD: Asus P6T Intel X58 Chipset SLI/CrossFireX Mainboard Triple-Channel DDR3/1600 SATA RAID w/ eSATA,GbLAN,USB2.0,IEEE1394a,&7.1Audio
MEMORY: 12GB (6x2GB) PC1333 DDR3 PC3 10666 Triple Channel Memory
OS: Microsoft(R) Windows Vista(TM) Home Premium w/ Service Pack 1
POWERSUPPLY: 650 Watts Power Supplies (Corsair CMPSU-650TX - Quad SLI Ready)
VIDEO: NVIDIA GeForce GTX260 896MB 16X PCI Express [+214] (Major Brand Powered by NVIDIA)

As you can see, I decided to go with a regular HDD for the OS and a cheapish ($185) SSD drive that I'll use for WoW. Hopefully everything else is up to par.

The total came up to almost $2000, so with that expenditure I really appreciate your guidance. In 2 weeks or so I should be playing in style!