[CentOS] Dell Dimension C521n

I'm in an all-Dell shop and am contemplating buying one of these to use as 
an "emergency gateway server" in case my primary fails. It'll let me take 
the primary out of service to upgrade its OS. Has anyone installed CentOS 
on one of these? Any gotchas?

It looks like I can buy this model with these tweaks for about $480:

AMD Athlon 64 X2 Dual-Core 3600+
FreeDOS included in the box, ready to install
2GB Dual Channel DDR2 SDRAM at 667MHz- 2DIMMs
Free Upgrade from 80GB to 160GB (7200RPM) w/DataBurst Cache
16X DVD-ROM Drive
NVIDIA GeForce 6150 LE Integrated Graphics GPU
Integrated 7.1 Channel Audio