I'm a newb when it comes to the Osx86 but not to Mac OS. Currently running a MacBook Pro Core Duo and am going to build a custom Intel i7 "Nehalem" 920 rig. If you are building from scratch and looking to put together an i7 system that would run around $1200 and (obviously) run OS X with no problems, what components would you choose? I can buy the i7 920 at my local Microcenter in Columbus, Ohio for around $230. What OS X distro would you choose? I've been reading ideneb is the easiest to install for the i7 to work. If you currently have a working i7 system, please recommend:

Motherboard (Gigabyte?)
Video Card (mid to high end modern card good for gaming would be nice)
Internal Wireless Card that supports 802.n
Sound Card
OS X distro (would like a distro that could be upgraded, but easiest install is first priority)

Thanks!