Motherboard Under 3K !!!

[acewin]

Gigabyte GA-EG31MF-S2(rev 2) is around 3.2K good for OC also
Anyhow in 3K budget DG31 chipset based mobos are better (if you do not consider intel's bad onboard gfx) check Gigabyte and MSI site for all DG31 mobos
Besides this is Palit N73PV in 2.7K based on nVidia 630i chipset and nVidia 7100 gfx far more better than asus p5n mx and also good for OCing
Besides these if you can find Biostar intel DG31 chipset or nVidia 630i mobos they are also big VFM

 

[Revolution]

If I chose 45nm CPU like Intel E7200 or E5200 then there is no choice but G31 near 3K budget

 

[comp@ddict]

A P35a chipset for 3k is much better.

No OC issues, no PCIE blah blah issues(that's what i know).