Raid question: Matching Hard Drives

[PerchPro]

I am going to set up a RAID 0,1 system on a HPT372 controller on an EPOX 4G4A+ board. I have 4 WD 7200RPM hard drives. 2 with an 8MB buffer, 2 with a 2MB buffer. Do all hard drive specs have to matchup to do an effective RAID 0,1 system or would this combination of drives be okay and how would I pair them on the mirror or stripe setup? ie 8MB cache drives together striping writing to the 2MB drives on the mirror? Would I be better off with 4 identical drives in this particular situation?

Thanks in advance