HP/Dell RAID

[L. V. Lammert]

Looking to build a couple of production servers, so I was thinking about 
heading to the local 'recycled' store for off-lease systems.

Only problem is, it's really hard to figure out if the RAID controllers are 
compatible (e.g. Perc 3 vs. OpenBSD Perc 5); can anyone share any 
recommendations? For example:

Dell 16005C (Perc 3 SC),  4600 (Perc 3 DC-128), 600SC (Perc DAT8)
Compaq ML350GB (Smart 532), ML370 G4 (Smart 642)

        TIA,

        Lee