Like you I purchased my copy last summer on EBay with the original paperback guide( $30)....then bought Dragonborn and Dawnguard to enrich my playing pleasure....both have cool features that enhance play....the crossbow from Dawnguard is a blast and Dragonborn allows you to tame dragons and ride them......currently playing a Nord....with a twist( playing him like Agent 47/Solid Snake).....
There's a PC mod for Dragon Crossbows, my favourite thing in the game lol.
As for me;
Skyrim is one of my main games, modded to heck.
Anno 2070 is one I'm into currently also.
Metal Gear Series, been into these since PS1, just picked up the remakes now my PS2 has died, so happy times. Revengeance is a pretty awesome game too.
GTA5, though I'm pretty bored with this now, into the trade-in fodder I feel.
Assassins Creed Series - I have all of these and various special editions of all but the first, second favourite series after MGS.
Bioshock Series is what me and my other half sit in and play if the weather's grim or there's nothing better to do.
The Last of Us is basically the same as Bioshock here

Saints Row the Third - picked up the complete version with all DLC for like £5 on Steam, so why not.
Oblivion is generally a standard

Fallout 3 I'm still getting some good wear out of, especially with mods.
Tomb Raider (Latest one) is a good game, kept me entertained a while and picked up on Steam for a few quid with all the DLC.
Infamous 2 is a good laugh from time-to-time, and free on PSN.
Sims3 is something I've spent way too much time and money on, but it's still one of my favourite games just to sit and relax with.
Pokemon X and Y - I love the Pokemon series and I have a game from all sets that have been released, I only have a few missing from having all the pokemon games since Gameboy.
Lego Games are something generally I quite like, you get the story of various films and such, with the lego twist - especially enjoying The Lord of the Rings Lego game at the moment on my 3DS, probably picking up a PS4 with the Marvel Superhero's in the next few days.
Mercenaries 2 because blowing everything up in sight is a good way to kill time. And thousands of digital people.
Plenty more too really, just these are what tend to take most of my time up
