Green Man Gaming has the Steam version of Deus Ex: HR for $30 for this weekend only.
Get this game. It is good. I just played through it the other day!
It's nice and long but doesn't wear out its welcome.
If I could give one good piece of non-spoiler advice it's "make the first upgrade you get be the Typhoon system"...the game has about 2 or 3 stupid out of place boss fights (but they don't ruin the whole game) and they are easily neutralized in seconds with the Typhoon weapon. Enjoy!