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I've had lots of luck with supermicro server as whitebox solutions for ESX, and they are very speedy machine as well.
Get *X7DB8+, 2x E5450, and max the memory and I am pretty sure it will do everything that you wanted.
You also are going to need some serious drive system to handle IO from 30 VM's.
Running 8 10K sas disks seems to give enough io for 30 super heavily used xp systems and 50 lightly used systems.
running ASUS P6T i7 8 cores, 24GB RAM, 6x1.5 TB drives, intel Pro 1000 nic cards on ESXi4
no problem at all.
i recommend a LSI RAID SATA card if you want raid capability