Velociraptor vs 2TB
Whether you use RAID0 with these or not, it's interesting to note something often overlooked:
Gamers usually get drives based on the average read speed. A hard drive is fastest on the outer edge (first programs installed) and about HALF the speed on the inner edge (programs installed when it's almost FULL).
Here's the interesting thing:
The Velociraptor 300GB is something like 130MB/sec (can't remember) and drops to about 65MB/second. However, even though the 2TB Green is much slower on its outer edge it also DROPS MUCH SLOWER.
So the Velociraptor might only lead for the first 100GB or less!!
RAID0:
If you purchase 2x2TB it's still about the same price, or slightly cheaper than a 300GB Velociraptor. However, the average Read Speed (for game loading) is going to beat the Velociraptor in ALL cases (starting at about 200MB/sec and dropping SLOWLY to "only" 100MB/second. You'll also have 4TB of space which is about 13x the space for roughly the same price.
That's why I think the following setup is ideal for many:
1) 60GB SSD (or 2x60GB RAID) for Windows 7 x64 Premium
2) 2x1TB or 2x2TB RAID0 (games, media, and backup)
*My second drive (soon to be RAID0) is my "E" drive. When I install games I usually just change the "C" to "E" in the recommended file path name.