any wireless nic should work with netstumbler. at least i know my linksys will.
as far as the model of orinoco. i am getting a gold pc card.
on insight.com they have the ones that do 802.11g and the ones that don't.
i'd get the one that does.
i don't know what the diff is between the combo card and the pc card,
they both look like they are pcmcia and the pc card is like $20 cheaper.