VMware ESXi compatible RAID card for the Mac Pro

I have a 2009 Mac Pro that I'd like to add a hardware RAID card to. I am running VMware ESXi with various OSes running as VMs. The Apple RAID card is not what I'm looking for. I would also like to utilize the 4 hard drive bays and get 6G speeds. I have run into a few potential solutions, but have not been impressed. Anyone found a good solution?