i used digital optical out from my computer to reciever , havent seen yoru plans so cant comment to much but with digital optical i ran about 8m to my reciever from computer with good sound , maybe you could put a digital optical in on it and pick up a reciever with optical out they are pretty cheap , remember the better amp the better sound from digital music , im looking at now buying a new marantz amp 1300 but poker is paying

also the better speakers are important , no good having a juke that sounds crap
what software are you going to use
i looked at as many jukes and buttons before i made mine , mines out to paint right now cant wait till i get it back
i also used a griffen powermate volume control , look them up as it has six mappable options and can be used for next song etc as well soving on buttons