ok, here's the situation.

i have 4 sata and 1 ide port on my board.
1 is taken for my ssd and 1 for my blu ray burner, so that leaves me 2 sata and 1 ide ports open.
now, i have
1 x 320gig 7200rpm (sata)
1 x 320gig 5400rpm (sata)
1 x 160gig 5400rpm (sata)
1 x 80gig 7200rpm (ide)
1 x 36gig raptor (sata)

I want to combine the drives to create the largest partition i can get. speed isn't absolutely mandatory, but i can't allow it to be slow either.
i was thinking of doing a few different things to get the largest partition i can get, without it causing lag etc.

i have an ide to sata adapter here that could be used to alter the onboard ide to sata, to be able to add in an additional drive, but it would slow the sata drives down correct? how bad?

my primary thought is to take the 2 x 320gig drives and either raid 0 them, for a "640" partition and call it good. but if possible, would it be feasible to add in the 160gig using the sata/ide adapter and raid 0, or the equivalent of all 3 drives?

i've been running the 320 and 80gigs separate up until now, but am tired of trying to keep track what is where, etc.

any suggestions on the best way to run the drives would be appreciated.

tia