For years now I've been digging through the osr picking up some great games and playing them, but this game hit me different. Recently if found I wanted to play an old setting but hacking new races and rules into my game seemed like too much work so I went looking and found whitehack.
This game can play just about any fantasy game idea you have and play it well. The characters feel refreshingly open allowing for a wide range of concept and the free form magic makes spell casting feel unpredictable but extremely useful. And the rules are a life saver for gm's with not much time to prep with small monster stat blocks and loose limits.
I think that if you are interested in a lighter yet deeper fantasy system to play your ideal game you couldn't do much better than whitehack.