It depends upon what your after:
Fastest app performance = VelociRaptor, period.
Highest Throughput = RAID 0.
Best data protection = VelociRaptor, b/c with RAID 0 your risk increases.
However, from reviews I've seen on NewEgg, it sounds like the 300GB version, I believe it is, of the VelociRaptor has given some people fits with crashing early. But on the whole, I think people have had no problems.
I personally have 2 74GB Raptors with 16MB Cache each. RAID 0 with those was really nice, but was on older hardware - CPU/Mainboard. Since I upgraded my CPU/Mainboard, I haven't tried RAID 0 yet (may actually soon), but just the single RAPTOR makes a really nice difference in everything - Windows startup, Audio editing, Video editing, Gaming, etc.
If you are looking for accross the board performance, you can't go wrong with the Raptor or VelociRaptor especially. If I had money to burn, I'd seriously think of grabbing up at least the 150GB VelociRaptor if not the 300GB version.
And actually, if you could afford it, you could put 3 of those in a RAID 5 or similar array and have speed, throughput, and redundancy.
As far as what drives have the most throughput, performance, etc, you can look at the detailed reports at Tom's Hardware:
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"If to err is human, then I must be some kind of human!" -Me