$15 is a very fair price for Deus Ex, Deus Ex: Human Revolution Director's Cut, Just Cause 2, Lara Croft and the Guardian of Light, and Kane & Lynch 2, if you don't already own them. It's still not bad even if you do have some. That you'd also get at least a dozen other games, ranging in quality from old Thief (at the high end) to Daikatana (on the low), is just gravy.
Square Enix are flogging 16 or so games cheap in the latest Humble Bundle, coming in three tiers depending on how much you fancy spending. It's well worth a look.
The cheapest tier, pay-what-you-want above $1, gives Thief, Hitman, Hitman 2, Anachronox, Daikatana, and Mini Ninjas. Some of those are jolly good, and well worth whatever you deem them worth. Paying above the average (currently $7.99) also gets you Hitman: Absolution, Deus Ex: Invisible War, the PC port of Deus Ex: The Fall, access to the free-to-play Nosgoth's beta, Battlestations: Midway, and a yet-to-be-revealed game (or games). Then $15 gets you the whole lot and those other fancy games.
You've probably picked up a fair few of these before, but it's a good load of gaming. It's also pretty much everything of note Square Enix has released on PC. New games like new Tomb Raider, new Thief, and, er, Murdered: Soul Suspect are understandably absent, of course.
I know how buying bundles goes: you plonk all the games in your Steam account then only ever play two or three. Assuming that you've already played most of the big names in this bundle, I will recommend that you try Kane & Lynch 2: Dog Days. That game gets a bum rap. It wears out its welcome towards the end, but I had a ball earlier on, playing a balding middle-aged dude who's stuck with terrible guns, pissing away ammo until he's forced to scramble closer to enemies to pick up more or swap weapons. It had a very enjoyable feeling of purposeful ineptness. Then ruins it all by handing out snazzy assault rifles. And its dirty, wet, neon-glazed Shanghai is still one of my favourite video game cities.
The Humble Square Enix Bundle will run for the next fortnight.