I'm selling a nice, gently used Asus G51 laptop, would make the perfect mame machine for any cab build.
Main cool features are....
i7 Processor
4GB RAM (although I have a feeling it might be 6gb gotta check)
Dual 7200 rpm 320gb drives (currently partitioned into 4 drives)
1920x1080 LED 15" screen
DVDRW Drive
Full size HDMI Out
Back-lit keyboard
and then of course the usual WiFi, Bluetooth, VGA Out, SD Card slot yadda yadda
I'm going to wipe the hard drives clean, currently it has the old Beta of Windows 8 on it, but I'm just going to zero out everything. It does have a windows 7 Home license sticker on the back but it's so faded you can't read the key so I'll let you choose what you want to do about operating systems.
Works perfectly, comes with power supply - $300 shipped in the U.S.