I'm very happy with my Dell XPS M1710 notebook. The Intel® Core™ 2 Duo T7600 Processor (2.33GHz,667MHz,4MB L2 cache); 512 Mb DDR3 nVidia GeForce Go 7950 GTX graphics card; and with 2 Mb RAM play SH3 like a dream and handle SH4 tolerably well. An added bonus is the 17.0" UltraSharp™ Wide Screen WUXGA (1920x1200) TFT Display. Both games look superb.

laptop for SH3/GWX
 

An Apple Macbook Pro 15" laptop runs SH3 (and SH4 !!) brilliantly, in Windows XP.

2.4Ghz Intel Core 2 Duo processors with a Nvidia Geforce 8600M GT graphics card and 256 of video/SDram. Need 2 Gigs of Ram, 1 Gig is not enough - but you can fit up to 4 Gb if you wanna go ballistic !!! :-)

160Gb HDD @5400rpm, but optional 200GB 7200RPM hard drive available - for about $130 extra cost.

1440 x 900 native wide-screen resolution, get about 3.5 hours life on full battery at full processor speed, but runs even better connected to power supply.
Frame rate is excellent. No problems even in port without lite harbor traffic enabled.

Works nicely connected to a 2nd (20") monitor also. Use a pair of bluetooth headphones for serious immersion in the game, as all laptop speakers I've heard are a bit cr*p.

'Bout $1900 bucks now I think.

Seriously fast laptop ...and really good for gaming, altho' I bought it for work (of course!)

Capn Mike