Re: RAID 0 question
RAID 0 requires two drives of the same type; in other words, two 80GB drives. Best way is to use identical products.
RAID 0 is not really a good way to go, in my opinion-- it's supposed to reduced data access times by roughly half, but that is only of use to large corporate concerns and high-end gamers. Since the data is split between the two drives, if one drive goes, then you've lost all of your data.
If you are going to use RAID, then I recommend at least RAID 1-- same pair of drives, but your data is mirrored between both drives, so if one fails, you have everything on the other.