1. El Dorado - Drop target heaven, great layout, 4 flippers, beautiful chime sounds, elegant wedge head cabinet. I really love the challenge of picking off the drop targets. It's hard enough to do in random order but to try and only hit the lit ones for max scoring is really fun and rewarding (or frustrating depending on which way the evening is going). The only downside to this game is a mediocre art package (Target Alpha or Solar City are better).
2. Houdini - Unique shot layout, fun ruleset, beautiful art package, fantastic customer support from API, non-licensed theme. I know this one's not for everyone and there are a few clunky animations but what a great first game from a new manufacturer. BTW, people complain about how hard the narrow, right lane shot is but I can hit that one far more easily than the wide ramp shot. I guess it comes down to where the sweet spot on the flipper is.
3. Mata Hari - This is by far my wife's favorite game and so we play it a lot. It has wonderful flow and the shots just "feel" right. Not a deep game by any stretch of the imagination but it's classic old-school early SS pinball. I also like that it is one of the games that came out during the transition from EM chimes to SS rules and scoring. Sometimes I feel bad for the chime coils when we are on a scoring roll and the game is trying hard to keep up. It also has a beautiful and sexy art package and is one of my favorites from Dave Christensen.