Hard Drive for Operating System

Hi Everyone! I'm a newb with a question about hard drives. Currently I have a Seagate Barricuda 7200.11 16mb cache 250gb, and a Western Digital Cavier green 1.5tb.

I would like to keep my operating system and programs on a quick and efficient hard drive and use one for storage of music/movies and another for games.

I'd like to use the Seagate 250gb drive for the games, the WD 1.5tb for music/movies/storage. What would be a fast complimentary drive to put my OS and Programs on? Or am I better off buying a new drive for gaming and putting the OS and programs on the Seagate? I plan on playing games like Bio Shock 2, Crysis, Diablo 3.

My current System;

Antac 900 case,
EVGA 780i
Core 2 duo E8400 @ 3.6Ghz (400x9)
2 Zotac AMP! 8800GT SLI
8Gb SLI Ready OZC Ram
40" HD Samsung 550 tv for monitor
250Gb Seagate Barricuda 7200.11
1.5Tb Western Digital Caviar Green

Thanks, I was leaning towards the WD 640GB Black actualy, there really isn't much bad to say, and the reviews are great as far as speed go. I'm running Windows 7 Ultimate, and my budget is "the best deal I can get", I'm not concerned with cost too much, but want good bang for my buck. I think the WD Black is the way to go.

Sounds like a good deal on the Kingston SSD, I'll have to look into that one as well! Thanks Again