Regarding latency with a laptop, you need an external interface with quality ASIO drivers to get rid of latency.
http://www.usb-audio.com/Bill
Bill, I do use a Edirol audio interface with advanced driver option....it is manageable , but not near the zero latency of the MS...I don't understand how Dom got it at zero, but it works great..
What about your Wersi...does it handle VST's near zero latency?