Thanks for your replies.
Done a little back reading. So Elements/Greens are good for storage and viewing videos when I need to. Drives that use as a main drive (torrenting/encoding/games) are throw aways, it's up to the user's choice if it's Blue or Black (really pricey). Elements seems bulky and needs a power plug (seems annoying for me), what about passports? I bet they are greens too.
If you want storage elements is the way to go.
If you want the drive for torrenting then I would suggest Black. Caviar Black not Scorpio Black. Both have a 5 year warranty but caviar Black is better.
If you want to play games and encode stuff from it I would suggest Velociraptor. It's the fastest drive IMO.
Elements is basically a caviar Green drive put into an compact enclosure. While the Caviar Green drives don't have a very good reputation elements is considered as one of the best externals. As far as the Power plug goes every drive with >1TB capacity needs an external power supply.
And about the Passport drives, they don't need any external power and are available in less than or equal to 1TB capacity. I haven't used any so you can refer to kitaMesume post.