I just build a new system this pass weekend. Most was carried over from a existing SD editing system. Using a rackmount case to keep everything tidy.
Intel E6600 2.4GHz 4MB
Asus P5WDG2 WS Professional Dual-core and Quad core ready, Dual PCI-E, PCI-X, SATA-Raid 8 ports
Cosair 2GB kit PC-6200 DDR-2 800MHz 2x1024
NVIDIA 7950GT 512MB Dual DVI Fanless PCI-E 16x
ANTEC TP2-550EPS12V 550 Watt EPS
Adaptec PERC 320 PCI-X SCSI Raid Controller
Adaptec 2140 SATA Raid Controller
1 x Seagate 160GB SATA-2 3GB/S Boot
1 x Seagate 160GB SATA-2 3GB/S Scratch
4 x Seagate 250GB SATA 1.5GB/S in Adaptec RAID enclosure (4 drives fit in 2 5 1/4" bays) Raid storage
12 x Seagate 181gb Ultra320 SCA SCSI Raid 0 set Media Compaq/HP StorageWorks Enclosure (EBAY!)
4 x Seagate 141gb Ultra320 SCA SCSI Raid 0 set Render Compaq/HP StorageWorks Enclosure (EBAY!)
WinXP SP2
Avid Liquid Chrome HD 7.1 SP1 - HD-SDI, SDI, Analog, inputs and outputs
I threw in a bunch of test clips and everything went smoothly.
Overclocking it is the next thing once I get everything setup.
Might try to get 2 other StorageWorks Fiber Channel Arrays online but it's only 18gb drives.
All my other systems are linked via Gigabit Ethernet so I can pull clips from other servers. Old servers were turned into a MP3 storage. Another box is Photos/Video storage. One other box is e-mail and general web browsing.
Since most of the hard drives are older, it's cheaper to go full SATA. If you want to build an external SATA enclosure, look into using a InfiniBand 4x cable/transport link. There are RAID controllers with these connectors or if you have spare internal SATA ports, you can get a SATA to SLOT adapter.
Here's an example of how InfiniBand links can be used.
http://www.cooldrives.com/eidrrerasaii.html
Curtis