Built the ASUS P5B-VM you have listed. Ran Ok, but BIOS options, specifically RAM voltage was limited. No onboard RAID. RMA'D and built the P5B-VM DO which has better VR's, more BIOS options and a better southbridge with RAID capabilities. Would not recommend the P5B-VM.
What chipsets support the Q6600? What are you saying, ONLY 965/975? Well, here are a few more chipsets that support the Q6600 (about the most popular processor ever released by now). Intel X48, P45, X38, P35, G45 and G35. Then Nvidia 7xx, 6xx and 5xx series. Boards with these chipsets are for sale everywhere that carries PC components. The other boards you listed are G33 miro boards. They have onboard graphics. Didn't I read you didn't need onboard graphics in your POST? No time to go back and check what you said. I detect a little konfusion in your question. Oh..you are konfusion.