More performance focused? I wonder how much of a difference 5900 vs 7200 RPM would affect recording with Fraps or MSI Afterburner. These still have to get 120-140 MB/s read-write. But I saw a benchmark where SSDs helped significantly when recording with Fraps.
I would pull the drives and build a RAID 1 NAS with them (would buy two of these). 5900rpm would probably be fine, but I'm a picky SD'er and want 7200rpm for the best performance.