STAM, I am not certain what the built in sound chips are like for LTs, but on my regular PC and my VSL2020 soundcard I can operate the HQ Hyper Canvas at 2.9 ms. This is much better than hardware synths. In short, you notice no latency. In fact, anything less than 10 ms is good enough with the possible exception of drums and pianos played live.
You could use the HQ Hyper Canvas with OMB and Yamaha styles but you would need to tranpose the drum kits and ensure selection of appropriate drum kits for the styles. Otherwise you will end up with howling dogs, handclaps or other strange things (electronic kit instead of brush).
I should have noted that with the spec of Fran's Laptop he will be able to do all the things I currently do on my regular PCs - Kontakt, LiveSynth Pro, B4, Vocalizer, Live - Styler, Cubase SX and Project5 all running at the same time. He may need to get a Firewire HD, more memory and an Outboard Soundcard like Echo. On some of the other forums I attend, live (undead ones) entertainers are doing just that with a dumb keyboard attached. Small incremental costs for a rich man like Fran!!!
[This message has been edited by Frank L. Rosenthal (edited 08-30-2003).]