Thanks guys, it turns out I'll be getting a GF4 64MB w/TV-O extremely cheap from my brother who is updating his card also (but not for Mame).
That should work out great as I can use the money I'm saving to buy more ram. I think that's a smart thing to do under xp, my brother's machine has like a gig of ram and the games just zip up compared to my crappy 192mb. Should of realised that for myself.
As for the other emu's - I don't really plan to run them on my cab, I thought Zinc had no sound on most games? Please, tell me I'm wrong

And I was going to set up z26 and other console emu's though I think it would seem odd playing console games on a cab. No doubt it would work great but still...
BTW I'm using a PC monitor.