PC gets recommended a lot, but I can pick up a second hand 360 or ps3 for £60/70($100?) and I don't have to do anything to the hardware or os. But I've not looked too into PCs, so maybe they are cheaper than I thought?
With regards to games, I only really have my eye on GTA V and a COD or two. I enjoy shorter RPGs, adventure action games, some fps/3rdps. At the minute I'm playing a lot of Black Ops/MW3, Monster Hunter 4 and Tri Force Heroes for 3ds.