Johnny,

Try looking on Dancetech. It's a really useful resource site for all things to do with dance music (production, playback, studio kit, PA equip etc). They've got a good forum and FAQs about PCs etc here :
http://www.dancetech.com/aa_dt_new/index.cfm

In fact, if you email your above questions to the dancetech team, they'll probably send you a really good spec back within a day or two. I've used them for help and advice on PA equipment in the past and found them really helpful. They put me in touch with some companies I probably wouldn't have found by myself.

Good luck,
Patrick.