there is actually a fix for the esxi 5 and UEFI environment as well in the Dell version, so its best to use ours if using UEFI.
Just ordered a T110 II with E3-1240 and UEFI enablement for use as a virtualised home server.  Will most likely be using an Adapted 5445 RAID controller and VMware ESXi 5. Hope these questions aren't too daft, I had a quick search of the forums before posting but couldn't find much.
T110 II VMware ESXi 5