Dirt 3, Dirt Showdown and Skyrim DLCs.

Impulse buying all the way.

Sorry, I don't buy games. I just give them away.

EVERY SINGLE ONE OF THEM

Or none at all

A lot of games that i'll never find the time to play, as in every steam sale since i got a decent job 3 years ago :D

Depending on the prices ...
TL2, AoE2, SSI, XCOM DLC, and other Wishlisters

All the games with cards. So I can sell the cards and get some cash back.

Hoping for the C&C franchise to get a significant discount (-80%+) so I can pick it up. Also If the price is right:

Anno 2070 Complete Collection.
Tomb Rider DLC
Skyrim DLC
BL2 Season Pass

Prefer buy skyrim bundle on humble bundle rather buy from steamstore

Coop games to play with friends, or really good prices on games I want, but I'm not buying much, because I want to complete those I have and those I started and haven't finished yet :)

TES 3,4 and 5 with all DLC / somekind of megapack for 30$ maybe?

And complete my fallout collection, some Las Vegas DLC missing :)

Skyrim Legendary Editon

Skyrim Legendary Edition, Fallout 3 and NV and everything i see and want to have :D

Just get L4D2 tbh, no reason to get the first as well. Also, there is no Bioshock 3, in that sense you should call New Vegas, Fallout 4.
Maybe I'll get stuff from my wishlist.. Dust,TL2,Sonic&ART,STALKERs,Dishonored,DmC. But Steam sales have been lacking last year, so I'll probably get them elsewhere, whenever possible.

HL3, Fortix, L4D 2, Don't Starve

Fortix, Fortix 2, every game that supports steam trading cards.

There are none I really plan on getting.

Half Life Complete Pack, or something like this.

all the games OP wants to buy are good, so go for them when they go on their biggest discount ;)

as for me, i'm looking forward for AC3, and DLCs for Skyrim

Dont starve, CS GO, Borderlands 2.

I want this games:

Dishonored,
Fallout 3,
Fallout NV ultimate,
Skyrim DLCs,
Dark Souls,
Borderlands 2 Season Pass,
Xcom EU (maybe not - soon release at iOS)

and some random co-op games.

Tomb Raider