you can get a mobo with raid on it, that will allow 8 devices to be connected. since abit introduced raid on their line of mobos, i have gone with raid ever since due to me having:
ls120
dvd
cdr
2x hdd
working all fine on abit kt7a-raid.
having raid onboard doesnt mean you HAVE to use it in raid config, if not, then it acts as ide 3 and ide 4 interfaces apart from standard ide1 and ide2.