Look at newly released Abit AW9D series, don't think it has pipes (check it). You're in an overclocking forum so I'll tell you that it has the same FSB potential as P5W DH.
If you intend to overclock and want still wants two PCIe 16x slots, you're stucked with 975X for now.
nForce 590 Intel Edition was not intended for overclocking. The reason is in another thread in this OC-Mobo forum.
I did look at this abit board previously but didnt consider becaue of the heat pipes. The heat pipe doesnt seem much diff then p5w's. Anyways I just emailed abit and asked them if the upside down orientation will mess with cooling.
If the orientation isnt a prob then this board looks pretty good, i have used abit before and it was pretty stable for overclocking.