decisions, decisions…

Ok, gamer friends. Help me make a decision. I have $10 burning a hole in my PayPal pocket, and want to get a game on Steam (and/or XBLA). Do I…

A) Get Limbo

B) Shell out an extra $5 and get Bastion

C) Shell out and extra $5 and get Torchlight

or

D) Shell out an extra $10 and actually legitimately purchase the Half-Life 2 trilogy I already know and love.

Your thoughts?