If you want to get stupid-fast SSD speeds, look into OCZ's Revo drives. The 80GB is $249 and the 120GB is $310, but the read speed is up to 540MB/s and the write speed is up to 490MB/s. They use the PCI-E x4 (or a spare x16) so the transfer rate is awesome. They make bigger sizes, as well as the RevoDrive X2's but the X2's start at $429 for 100GB (but reads speeds up to 740MB/s and write speeds up to 690MB/s). Serious geek pr0n right there, boys.
Newegg.com - OCZ RevoDrive OCZSSDPX-1RVD0080 PCI-Express x4 80GB PCI Express MLC Internal Solid State Drive (SSD)
Newegg.com - OCZ RevoDrive OCZSSDPX-1RVD0120 PCI-E x4 120GB PCI Express MLC Internal Solid State Drive (SSD)
Newegg.com - OCZ RevoDrive X2 OCZSSDPX-1RVDX0100 PCI-E 100GB PCI-Express x4 MLC Internal Solid State Drive (SSD)
Newegg.com - OCZ RevoDrive OCZSSDPX-1RVD0080 PCI-Express x4 80GB PCI Express MLC Internal Solid State Drive (SSD)
Newegg.com - OCZ RevoDrive OCZSSDPX-1RVD0120 PCI-E x4 120GB PCI Express MLC Internal Solid State Drive (SSD)
Newegg.com - OCZ RevoDrive X2 OCZSSDPX-1RVDX0100 PCI-E 100GB PCI-Express x4 MLC Internal Solid State Drive (SSD)