Can someone suggest a good laptop for On Location?

I've used a 2Ghz dual-core Sony VAIO for the past 2 years to capture stage shows directly to disk in HDV using On Location. Its been very reliable and has enough power to provide a monitor screen while recording, albeit at a reduced frame rate. My VAIO has 2 onboard 5400 rpm drives, one dedicated to video capture, but a single drive machine should be fine.