Disregard the PSU recommendations in the manuals. The GPU dictates how much overall wattages are needed.
Out of the 2 mobos, I'd go with ASUS as the layout is better in that the CPU/AUX power connector is by the edge & back I/O. The one in GB is in the middle and it CAN hinder some configs like a big cpu/exhaust cooler. However, the GB has PS/2 keyboard & mouse so if your OS requires 'em, GB it is. i.e. ancient Linux distros. The GB has 6 built-in USB ports & IEEE. GB wins in features dept.
No point in getting the fastest ram unless you overclock on DICE/phase/LN2.http://www.newegg.com/Product/Product.aspx?Item=N82E16820227346