Since the May comp is in it's second half, I thought i'd have a quick browse through the Steam store and find some great titles for less the $20. All the games I'm about to list I have either played or currently play and I recommend feel free to chuck in your own recommendations.
Individual Games and Packs:
- Counter Strike: Source - $20
- Team Fortress 2 - $20
- S.T.A.L.K.E.R Shadow of Chernobyl - $15
- Company of Heroes - $15 (Although I recommend you save $50 and get the anthology)
- Rome: Total War Gold Edition - $10
- Garry's Mod - $10
- Lego Start Wars Complete Saga - $20 (I have a strange love for these games)
- Hitman Blood Money - $10
- Dawn of War Anthology - $15 (the original DoW and the first 2 expansions Winter Assault and Dark Crusade)
- The Hitman Collection - $20
- Star Wars Battlefront 2 - $20
They are just some of the games I found in my quick search but you have 773 games and 51 packs to choose from with your $20, If your looking to "make" your own pack i recommend just getting a couple of $10 games.
Now some of you are probably gonna say you left out Half Life and other more famous titles now, I did but most games you'll notice that I left out I have either completely missed in my quick scan over the games, Haven't played, or have played but only barely and can't give a real recommendation.
Note: I rounded all the prices to the nearest $.