Granted, I'm not exactly answering your question, but for the Poor Man's Solution, I used a cheap $20 Rosewill card from Newegg. It has the Sil3512 chipset. You can read more about compatible storage controllers here:
Whitebox HCL
This is the $20 card I purchased, and just got ESXi 4 installed on.
Newegg
The reason I said that I'm not really answering your question....is that this card works, but not in RAID mode. My disks are recognized, just not in a RAID configuration.