1) Stalker

2) Half Life 2:Episode 2

3) The Titan Quest complete pack

My trigger finger is getting itchy for some clicky killing, and after hearing that Titan Quest has been optimized to run smoother (the demo had some chugs at 1680x1050 for me) I'm really intrigued.

Of those three... I'd go with Titan Quest. It is good fun, especially if you have friends to play it with. On your own not so much.

Stalker would be a decent second place.

Not much of a reason to buy HL2 E2 on it's own when for $50 you can get it, Portal, and TF2. I'm assuming you already have HL2 and E1. If you haven't played Portal yet, you really REALLY should.

Titan Quest is the most clicky death game.

Stalker needs it's mods to be really playable. It's a mostly very wide open style of game.

I would not buy episode 2 by itself. Portal, I consider a must play, but it fails in the "Clicky Killing" benchmarks.

Titan Quest - lots of mayhem to be had there...

Yeah - I'm pretty sure I'm going to pick up Titan Quest complete today. Like I said before - the demo chugged in spots at 1680x1050 but I've swapped my 4200+ for a 6400+ so that should help.

An I read somewhere the expansion has smoothed out the general gameplay.

I'll save Stalker for later and buy Ep 2 when Valve drops the price.

edit - I got the Portal:first slice off of Steam. I'll try that too.

I love Portal. I just re-played the entire game through again yesterday.

As far as Stalker vs. Titan Quest, I was wondering the exact same thing as, Ananan. Now, after reading this thread, I think I'll pick up Titan Quest on my way home today.

Titan Quest (80% Average Ratio)
S.T.A.L.K.E.R. (82% Average Ratio)
Half-Life 2: Episode 2 (90% Average Ratio)

I love Half Life 2, Ep2 over those other games. That being said, folks here are right, grab the orange box if you're getting Ep2. It's well worth the cash. Portal, TF2, and Ep2 are all fantastic games. I gave a buddy of mine HL2 and HL2 Ep1 with the gift program Valve has.