You had the Saitek Eclipse II before didn't you Jay? I'm still using mine and love it. Not many keyboards out thier that I like that have the standard 104 key design with a blue backlight.
as the G400 its not much different then the MX518, same mouse basicly...
i7 2600k @ 4.2Ghz | 16GB Corsair Vengeance DDR3 1333 | 4GB EVGA GTX 770 SC ACX | EVGA Z68 SLI