Fallout 3 or newvegas --->best choice
And I guarenntee 100% u will come back to toribash!
7daystodie
Garrysmod
Sven coop
Zombie panic
I can go on
Team Fortress 2!! That shit is strategy, and also has an economy that is way more fun than the toribash economy (imo). Best first person shooter out there, if you ask me.
Talkin' about sandbox games, try garrys mod? I tried that one out last week, it's a lot of fun.