HP xw4600 vs Dell Precision T3400 for SP SDI

[Aristotelis]

Dell Precision T3400 525W

• Windows Vista Business to XP Pro (Downgrade)
• Intel Core 2 Duo E6850
• 2 x 1GB 800Mhz DDR2 ECC
• ATI FireGL V3600 256MB
• 4 x 500GB SATA 7200 with DataBurst cache (RAID 10)
• 16xDVD-ROM
• 16x DVD+/-RW

HP xw4600

• Windows Vista Business to XP Pro (Downgrade)
• Intel Core 2 Duo E6850
• 2 x 1GB 800Mhz DDR2 ECC
• ATI FireGL V5600 512MB
• 1 x 160GB SATA 7200 NCQ
• 2 x 1TB SATA 7200 NCQ
• 16x/48x DVD-ROM SATA
• 16xDVD+-RW SATA

Has anyone tried these systems with Edius SP SDI? Are there any compatibility issues?

Which one would you recommend? They cost almost the same. I'm trying to avoid building a custom system because we need 24x7 support in case of hardware failure.