I can't tell you which laptop but I can point out some areas of consideration. Audio/Video production can bring a decent desktop to it's knees. Much less a laptop.
I have the HP 772n Desktop which came stock as follows.
2.2 ghz / 512 ram / 80 gig samsung w/2mb cache @ 5400 rpm / xp home
Multi track audio (via cakewalk) stammered and stuttered and popped.
I bumped the ram to 1 gig pulled out the 80 gig drive and put it in an external case for storage and installed two WD 120 gig drives with 8mb cache @ 7500 rpm.
Put the music application on one drive and the data (projects/songs) on the other and split the swap file 1/2 on one drive and 1/2 on the other. Now this system is very smooth and stable.
A desktop will give you more performance for the same $$$ but you can pull it off on a laptop.
Balance your budget between fast processor, lots of memory and a large, fast HD. Preferably 2.
So, I'm looking to buy a PC laptop in the next month or so to do audio production (I know, I know - PC laptops suck, but I live in New York and I can't afford the space for a desktop rig). I'll be using Cubase SX, SF Acid, Vegas, and Sound Forge, and running all audio through a Tascam US-428 USB interface.
Given that, I'm wondering if anyone has any recommendations as to what I should be looking for in a laptop? I've been looking at the Toshiba Satellite P25 or P35, but want to know if there's something else I'm napping on.