Did you get CS:GO? I've yet to try it out... visually looks alot better but dunno what features they've added or taken away from the original. Also if you wanna purchase games for Steam or Origin or whatever gaming platform you use, then always worth visiting
http://www.ultimatumgamekeys.co.uk as the savings can be quite substantial (eg Dead Space 3 pre order on Origin is £39.99 but on here it's £23.38!!!). The benefits of PC gaming is how dirt cheap you can get the games, even on release day! Yes it may cost a few bob building a system that'll cope with todays games BUT in the long run if you buy alot of games you'll save in that department as console games take a while to drop in price.
Not to mention as I said a few pages back, 1080p gaming with Anti-Alaising (two things consoles don't have... yet) is so pleasing on the eye. Makes games such as Dead SPace, 4yrs old, cut it with games of today visually.
As for Batman Arkham City. £12.99 is cheap. It's only a couple pence cheaper on that site I mentioned above... BUT you can get both Arkham City and Arkham Asylum for another £3.40 if you fancied revisiting the first game again?
http://www.ultimatumgamekeys.co.uk/en/game/buy-batman-series-bundle-pack-key-steam.html