We're currently using a Dell PowerEdge R710 with dual 6-core Xeon 2.67GHz procs, 94 GB RAM, and 400 GB RAID. Can't remember for sure but my colleague things it's RAID 10.
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[root@stlairwave-prd2 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00 398G 214G 165G 57% /
tmpfs 48G 0 48G 0% /dev/shm
/dev/sda1 93M 34M 55M 38% /boot