Well, unless you have TONS of files and saved video, your 1TB drive should be sufficient. Adding a second drive is about as easy as it gets and I HIGHLY recommend the Samsung drives. I use Samsung exclusively in my rigs and I have had ZERO problems with them.
Up to you whether you add another drive or not (depends on how much space you have and expect to need). When you do make that choice, the Samsung drives are great.
Well the first drive may be sufficent for recording. But from reading from guys who use it this is a bad idea because fraps seems to straing the hard drive because then it seems to play the game and record footage to itself slowing it down in gameplay.