Remember with things like that Sager stuff that:
1) they heat up too much (normal bigass pentiums and super heated videocards are fun .. but NOT in a small case)
2) 2.5 hours of battery time is badass LITTLE
3) as stated in point 1, a lot of the hardware is NOT designed for notebooks. You wont buy what you want, promised.
as for notebooks, go with companies that know what they really do.
I checked out the alienware links and if they made their cases somewhat good (which I highly think they did - seen their long time and good name in the computer business) those are good laptops.
Dell makes good laptops and almost sells the most of em, too

Sony is known for good laptops
HP, Compaq I've seen people use without big problems
Almost ALL new laptops have a VGA-out card to connect a monitor to. If thats not enough you might wanna check out these USB breakout boxes with their own little video card for an extra screen (that would be, TFT from laptop, 1 monitor from the laptop out, plus one extra from the breakout box)
Also, have you checked out Apple? If its not your system it sucks, but I think alot of companies will have ported their software to be able to run on *nix platforms right now, right?
Powerbook 15/17" are .. well how shall we put it.. "fucking sweet"

Only drawdowns are price (which is huge (especially in europe)), and compatibility with windows programs (only available through emulators at low speed), asides from that, these are the very very best IMO
Tiki