Well Nightsky really looks the pick of the lot. Fate of the world doesn't have a good review at PC Gamer (61/100) but there's a update pack released this September by the name of Fate of the World: Tipping Point which includes the “Cornucopia” and “Earth Day” update missions, and the “Denial”, “Migration” and “Extras Pack” DLCs along with the 5 original missions. Don't know if these will be added later on.
Scoregasm is a space shooter and had a favorable review at GamePro. Time Gentlemen, Please! and Ben There, Dan That! are actually 2 different point-and-click adventure games (so that makes it 5 games) released 2-3 years earlier. Time Gentlemen has very good scores in Metacritic so this should be good.
Now thinking about the amount to spend.
For those interested, Scorgasm trailer:-
[YOUTUBE]UTEYVxLr0os[/YOUTUBE]
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There's a Assasin's Creed offer going on at Gamersgate and F1 2011 is 50% off in Steam. Had to settle for $5 this time.