-Super-strong, memorable melodies.
-Guitar and synth solos.
-High-energy melodic vocals. They can be laced with a bit of goofiness too, and I'll eat that stuff right up (see: the soundtrack for Daytona USA)
-Bass in general. Groovy and funky, manic and progressive, or thumping and powerful; I tend to really get into the bass of a song when it's prominent.
-High levels of songwriting prowess and musicianship.