I have a 1TB WD Caviar Black as my main disk for programs, games, etc, it was the best drive out there without having to spend a fortune on a big SSD (60GB is not enough for a system drive), also SSDs fail a lot.
Then for data I have 2 externals (a 2TB and an old 200GB) and a couple of internals that I have salvaged from here and there: a janky 60GB SSD (it fails a lot) and a 250GB HD from my old computer