I like designers who tend to take some risks with each new design. So my top list is:
1) Dennis Nordman
2) Python Anghelo
3) Jpop
Steve Richie doesn't tend to take a lot of risks anymore, and Pat Lawlor has used a Whirlwind/Addams Family style layout fairly often. George Gomez usually does a fan layout, though I really like avenger's layout because it has a good risk with the "breakable" black widow cross ramp in the center of the playfield.
I'm not saying the games these other guys design aren't fun! I love Metallica, Rollergames, NGG, Road Show, etc... but I prefer layouts that try something different.
-Lin