Well for porno watching, video editing, snood playing, maybe the best thing is:

20 gb drive for the OS and anything related to the OS (drivers, etc.) You can also do this through drive partitioning, so then the OS doesn't have to scourge the entire length of drive for files.

20/20 mirroring drive-set so you can store and have a backup of all essential files (usually documents, so the drive doesn't have to be too big)

500/500 striping - for those big movies and faster seek times. Just beware of data loss in one sector can crash in another. But hey, you got $2700 what do you care.

Don't forget a lifetime supply of ky - $5.95 at most stores for a small bottle, I prefer the gentle warming one myself.