I'm about to purchase a new hard drive for my PC but thought I'd run it by some smarter people first. 
 
This is what I'm looking at getting:   Western Digital VelociRaptor 300GB/10000RPM 
 
Note: I don't use my PC for anything except for playing games. Not browsing the web, not storing media, not watching movies. Nothing.

That looks alright although I thought you could get a bigger hard drive for the same price. Then again the one I got was a 1 Terabyte external hard drive so I wouldn't really know. But in your case that looks fine. In my experience I've had no problems with Western Digital.

Seems like a decent choice if it is just going to be a place to install games onto. I'm from the UK so I'm not totally sure on prices over in the states but that seems pretty well priced for the product as well. Good stuff.

With a 10K RPM HDD you're paying a large premium for a smallish speed increase.  There will also be an increase in heat from the HDD, and I'm not sure how reliable 10K RPM HDDs are today, but in the past they were considerably less reliable.
 
Basically you could get a larger HDD for less than half as much money.  Also remember that theoretical increases in performance (such as seek times and bandwidth) don't equate to the same percentage of performance increase in real world load times and such.

Thanks guys. I don't need a larger hard drive. The one I'm using now is 120GB and I have about half that to spare. It's also connected with an IDE cable. It's pretty much the only thing I didn't upgrade a couple years ago. So now I'm just looking for an increase read/write speed. 

 @gpbmike:   Some googling seems to indicate that the board does have NCQ support, so hopefully your 10000RPM drive will be able to reach those speeds.

I run a 150 original raptor and its great, I also have tons of storage drives. If you just game on that system, go for it. The WD Black 640GB is another good choice if you wanna save some cash.

That's the drive I'm thinking about getting. I am stuck between that one, a SDD or a regular 7200rpm terrabyte sized HDD. I'll need at least 200GB for my steam folder so I think SDD is out of the question for a couple of years. So I was thinking about SDD for windows and a 10,000 for games. or maybe 2 7200RPM's in raid0. So many options.