What are your favorite game systems?

I'm kind of curious as to what my readers like. I'll post mine

My favorite systems are in order

1 -Eden Studios Unisystem, both Cinematic and Classic

2- GURPS

4- everything else

I suppose folks are probably saying WTF? right about now. Well simply, these are the rules and books I like the most not necessarily the ones I play the most.

That's why while I often post D&D in its various flavors, it gets a lot of play and design time the others do not.

How about you?