Should I get Portal or Half-Life 2 or Garry's Mod?

I

idiot

New member
I have an extra $10 on my Steam account. I wanted to get any game using Valve's Source Engine (considering that I'm a huge fucking Valve fanboy) and Portal, HL2, and GMod are both 10 dollars. I need for someone to tell me the pros and cons of these 3 games so I can decider what to buy.

Thanks for reading.
or should I get Team Fortress Classic?
@Gezo I already have Counter Strike: Source so GMod would work perfectly fine.
 
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