What is the budget for the Mobo?

For the time being i recommend this mobo it's slighty on the expensive side but it comes with a sound blaster XFi extreme sound card :

MSI P7N Diamond nForce 780i SLi (Socket 775)

"Space has no boundary, that is empirically more certain than any external observation. However, that does not imply that space is infinite" - Bernhard Riemann