As RossMAN already sagely suggested, I'd go with the Dell Inspiron 8000. I absolutely adore mine. Yes, I had some issues with it, but Dell took care of them all for me (Dell treats you especially well when you're still in your 30-day trial period). It comes standard with a 3 year on-site warranty--not too shabby at all.
It is huge (though not as heavy as its older cousins in the 7X00 series) but it is so full featured--I mean, c'mon--Firewire, 2 USB, S-Video/Composite/VGA out, even a coaxial S/PDIF out. I also really like the built-in 3Com NIC/56K modem, which frees up my PCMCIA slots for other stuff.
I got the 14" screen and a PIII 700. I also got the built-in DVD-ROM, the advanced port replicator, the swappable 8x CD-RW, and an extra battery, all for $2200 (it will be $1800 if I ever get my damned Dell rebate). That's a lot for the $$.
Only problem is that Dell doesn't offer the Geforce2Go cards (yet). I got a 16MB ATI Mobility M4 which is fine for me (I don't game much and this is my work PC anyway).
Sure, the Sony and Apple lappies are prettier, but they cost a lot more for the equivalent setup.
One caveat--if you're looking for true portability (lightweight, small, etc.) don't get the 8000. It's a desktop replacement laptop that can be portable, but it's definitely not meant for hardcore traveling.
If you need to know anything else about it, just ask.
l2c