Wow! A lot of recommendations here... might keep me going for the next 5 years! Many thanks all. I've now got all 3 Bioshock games, Civ5, Witcher 1 & 2, Deus Ex: Human Revolution, FTl and Tomb Raider all sat on Steam waiting for me. My Wishlist is also looking a great deal healthier.
As an aside, there seems to be quite a lot of mention made of controllers. I've never really used one (don't own any consoles except a Wii). Do they make things that much easier? Should I look to invest?
Has anyone mentioned the Football Manager games. They always seem to be right up at the top of my hours played list, so they much be doing something right.
Planetside 2 has deffinately got to be on that list.