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Civ 5
Kings Quest (2015)
Binding Of Isaac
Crimzon Clover
Baldurs Gate 2

Resident Evil 4, Tomb Raider, Metal Gear Solid V, Ultra Street Fighter IV, Rocksmith 2014

Mini Metro
Sunless Sea
Portal (and Portal 2 if allowed :P)
Skyrim
Fallout 3 or New Vegas

Only two games come to mind
Fallout New Vegas since I currently have a game going
Kerbal Space Program because it's so damn fun.

Most games that I really like and will replay one day, I will re-buy on GOG or already have a DRM-Free copy at Humble Bundle in case of a Steampocalypse..

CS: GO, Rocket League, Hotline Miami, Saints Row 3 and 4

I am going to list some games I bought in Early Access that I would buy again (some have been released):

1) Don't Starve... even more fun in multiplayer now.
2) Speedrunners... GREAT with friends and still pretty good in the online ranked leagues. Reminds me of Mario Kart but as a platformer.
3) Kerbal Space Program... I still need to start playing again after its official release.
4) Project Zomboid... really fun, and they offer a ton of customization so you can play how you want.
5) TES III: Morrowind... not early access, but the game that I have probably spent the most of my life playing. Owned it on Xbox, PC (lost it,) and will pick it up on Steam someday.

There are many others, but since there seems to be a lot of hate for Early Access I wanted to point out that they aren't all bad and abandoned.

Shadow Warrior
Divinity: Original Sin
The Binding of Isaac
Dark Souls
XCOM: Enemy Unknown

Csgo
Mount and blade
Just cause 2
Garry's mod
Fallout New Vegas

Just CSGO and possibly TF2. Anything else can be removed for all I care.
The games I typically play are F2P anyway.

No doubt for the first 2
Fallout New Vegas
Skyrim
Payday 2

Cant think off any others :P

Skyrim
Skyrim
Skyrim
Skyrim
oh and Skyrim

Tropico
Tropico 2
Tropico 3
Tropico 4
Tropico 5

yes, tonight i'm in the mood...

Borderlands 2
L4D2
Defense Grid
Orange Box
Injustice: Gods Among Us Ultimate Edition

rebuy something?

no, instead i would buy a shotgun and visit that human who responsible for losing my account. because i believe in draconian justice!

Skyrim, Final Fantasy III, The Darkness II, Party Hard, and Saints Row: The Third.

Watch_Dogs
Company of heroes
Door kickers
Empire total War
Shogun II total War

Civilization IV
Civilization V
The Witcher 3
Teleglitch
Xenonauts

+some tens of other games :p

Only 5? Oh god, more like 50

Ok, then both System Shock and all three BioShock games

My favorite 5 steam games:

1. Vampire: The Masquerade Bloodlines
2. Card Hunter
3. Trine 2
4. Every adventure game/point'n'click/TBS/co-op/RPG game in my library
5. Every other game in my library :P

5 most replayable:

1. Card Hunter
2. Vampire: The Masquerade Bloodlines
3. Sorry, too buy playing Card Hunter to add more.

I get the feeling my perspective may not entirely help, but that's what I've got :P

Transistor
Call of Duty 4 Modern Warfare
Metro 2033 (I did actually rebuy ... first from pirate to original and then again the Redux version)
Borderlands 2
Portal 2

payday 2
nba2k15
csgo
the witcher complete :P
dragon age complete

I would buy some pork and beer

1. CSGO
2. CSGO
3. CSGO
4. CSGO
5. CSGO

Fallout, Fallout 2, Baldur's Gate, Baldur's Gate 2, Arcanum (if it was available on Steam)

hmmm just speaking for me but i like that i have the games i finished and still need to play in my account. so having alot doesnt botter me.
but as for games.

those i will probably play again:
Mount and Blade Warband.
Grand Theft Auto V
Sniper Elite 3

for the rest who knows :)