Right now I only have a 250GB internal hard drive for my system. I bought it used, and it's pretty old; I don't know how long it's going to last. Not only that, but I'm running out of room; quickly.

Anyway, I'm thinking about getting a 1TB drive, but I'm not sure what company to go with. Right now, I'm looking at these drives:

http://www.newegg.com/Product/ProductList....l&name=32MB

... but I'm not really sure what the differences are. They're all 7200RPM Western Digital Hard Drives with 1TB of space and 32MB cache. Can anyone help me out here?

I've also been thinking about an external, but I'm not really sure I need one.

The Caviar Greens are the low power, low performance drives. If you want a quiet drive that would help you go 'green', that is what you want. The Caviar Blacks are the high performance drives. And I have no idea on the RE3's though.

WD caviar black or Seagate barracuda, go for the cheaper one
i personally own a 640Gb WD caviar black and 1TB Seagate barracuda, cant see a difference between the 2 HDDs, installed windows on caviar black

RAID Edition. It's pretty much a Caviar Black, but aimed at the enterprise level

If I was in the market for 1TB drives i'd get these http://www.newegg.com/Product/Product.aspx...N82E16822152102

That Samsung caught my eye. What does everyone else think about Samsungs?

I recall a couple of people here saying they had that Samsung drive and that they liked it. I believe Verran was one, don't remember who else though, sorry. Might ask him what he thinks.