I can recommend http://arpnetworks.com http://arpnetworks.com, and have used them for a long time (not VM but larger stuff). They are nearly totally a BSD shop

I can recommend http://arpnetworks.com http://arpnetworks.com, and have used them for a long time (not VM but larger stuff). They are nearly totally a BSD shop [pretty sure BSD comes before linux there], and extremely competent. The chatroom also has a lot of BSD users (open and free, maybe a net or two). FreeBSD does run for VMs, and it's very good.