When pushing the technical limits, one always ends up chasing a very limited number of 'first to market' manufacturers. On the topic of gigasampler/laptop compatible maufacturers Korean Egosys is the one.
(more to follow)

The Wami Box GSIF driver is (finaly) expected this month. Be aware however of the obibious limitations of Wamibox. Nevertheless it should work great with GS.

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The Wamibox faq: http://www.egosys.co.kr/eng/egosys.html

Some links:
[img]http://www.jam.se/wamibox.gif[img] http://www.sbfilmaudio.com/egosys.html
(also see for PCs: http://www.sbfilmaudio.com/nemesys.html

Some warning: http://www.hanme.co.kr/ego/FAQ-WB.htm