I almost bought the alienware 51M but they stopped doing the colour i wanted. so i went to sager and bought the better model from them for cheaper, here was a mixup in the ordering they gave me a 2.8G p4 instead of the 3.0 P4 hyperthreaded so i went in and while i was there i saw a new prototype case, which had the colour i wanted and they swapped it out for me, it was still about 1500 cheaper than the 15M and i have 16" screen instead of a 15"
they are all similar models, each of them uses the same base hardware, and build it themselves.they aren't identical, but they are pretty darn close.
its 16" LCD, 1G Ram 160GB harddisk space, ATI tv tuner, radeon 9000, got a numpad, 1600x1200 res, built in removable mp3 player, tv in, tv out, firewire , 4 usb ports, ps2 mouse,keyboard , parallel and serial port 3.0G P4 and a cool paint job that changes colour in the light, alienware call it chameleon , they didnt have it l a few weeks ago when i bought mine