What to play next folks?

I have a ton of games in my library and I am trying to go through them, I just completed 'Bastion' and now can't decide what to conquer next, so Ctrl+F my library and let me know which of these games you would recommend and a reason why?

I am open to any suggestions; also for those who got me on steam already PM me too with game ideas, having a lazy Sunday! Much love,

Behemoth x

Games in My Account

And Yet It Moves
Bastion
BEEP
BITTRIP RUNNER
Bunch of Heroes
Cave Story+
Cities in Motion
Cogs
Colin McRae DiRT 2
Counter-Strike
Counter-Strike 1 Anthology
Counter-Strike Complete
Counter-Strike: Condition Zero
Counter-Strike: Global Offensive
Counter-Strike: Source
Counter-Strike: Source + Garry's Mod
Crayon Physics Deluxe
Critical Mass
Darwinia
Day of Defeat
Day of Defeat: Source
Dead Horde
Dead Space
Dead Space 2
Deathmatch Classic
DEFCON
Defense Grid: Resurgence Map Pack 1
Defense Grid: Resurgence Map Pack 2
Defense Grid: Resurgence Map Pack 3
Defense Grid: Resurgence Map Pack 4
Defense Grid: The Awakening
Dota 2
Duke Nukem Forever
Dungeon Defenders
Dungeons of Dredmor
Faerie Solitaire
Fortix 2
Fractal: Make Blooms Not War
Frozen Synapse
Future Wars
Garry's Mod
Greed Corp
Greed: Black Border
Hacker Evolution
Hacker Evolution Collection
Hacker Evolution Duality
Hacker Evolution: Untold
Half-Life
Half-Life 1 Anthology
Half-Life 2
Half-Life 2: Deathmatch
Half-Life 2: Episode One
Half-Life 2: Episode Two
Half-Life 2: Lost Coast
Half-Life Complete
Half-Life Deathmatch: Source
Half-Life: Blue Shift
Half-Life: Opposing Force
Half-Life: Source
Hammerfight
Humble Frozen Synapse Bundle
Humble Indie Bundle #3
Humble Indie Bundle #4
Indie Gala 2 - The Carebear Bundle
Introversion Complete Pack
Jamestown
Killing Floor
King Arthur - The Role-playing Wargame
Left 4 Dead
Left 4 Dead 2
Lucid
Machinarium
Multiwinia
Multiwinia + Darwinia
NightSky
Plants vs Zombies GOTY Edition
Portal
Portal 2
Portal Bundle
Post Apocalyptic Mayhem
Psychonauts
Revenge of the Titans
Ricochet
Rochard
Samorost2
Sanctum
Serious Sam Classic: First Encounter
Shank
Sid Meier's Civilization III Complete
Sonic Adventure DX
Source Multiplayer Pack
Space Pirates and Zombies
Star Wars Jedi Knight: Dark Forces II
Storm in a Teacup
Super Meat Boy
Super MNC
Swords and Soldiers HD
Team Fortress 2
Team Fortress Classic
Terraria
The Binding of Isaac
The Orange Box
The Ship
The Ship - Complete Pack
The Ship Single Player
Time Gentlemen Please! and Ben There Dan That! Special Edition Double Pack
Titan Attacks!
Torchlight
Trapped Dead
Trauma
Trine 2
Two Worlds II
Uplink
UplinkDarwinia Pack
Valve Complete Pack
VVVVVV
Warhammer 40000: Space Marine
Windosill
Wizorb
World Basketball Manager 2010
Worms Reloaded
Zombie Shooter
Zombie Shooter 2

EDIT: I am going to be doing Halflife 2/Ep1/Ep2 first. Then will take your recommendations for future games :)