Baulder's Gate is a no brainer in my opinion. It's on a time limited sale so get it while it's cheap. Baulder's Gate has a ton of content and is a PC RPG classic.
Warhammer Quest is serviceable for what it is but easy and repeatative (you fight the same enemies in similar looking dungeons for 10 hours). Warhammer Quest is worth $4.99 but if you're short on cash then it's not essential, the application of board game rules is admirable and it's atmopsheric.