Drive Speed Comparisons - 7200RPM vs. 5400RPM in RAID?

O asks: "Looking at Pricewatch for new drives, it seems that the prices for a 60GB 5400rpm drive and a 40GB 7200rpm drive are about the same. I do have ATA/100 RAID on my motherboard, and I'm wondering how a striped RAID of 5400rpm drives would stack up against a single 7200rpm drive? I could sure get a hell of a lot more storage for the money. Any Slashdot readers have experience with this?"