I know this is probably a different genre than you are looking for, but the Dealands game (the non-d20 version) has some of the coolest mechanics around. I really like the card initiative system, the spellcasting system (draw a poker hand to see how well the spell went off), and its a pretty simple system overall. There are also fate chips that let you modify rolls, reduce damage, and perform heroic action. Combat does tend to be pretty deadly (especially firearms), so if you wanting a combat heavy campaign, you might have to give out more fate chips. Its got the right mixture of fantasy, great background, camp, and horror. Give it a look- you might really like it.