Try Special EFX, The Rippingtons, Spyra Gyra. Also you might like Joe Sample, David Sanborn, or Lonnie Liston Smith (earlier stuff). The latter three are more jazz than rock, they are a good transition into mainstream jazz.
I've become a Steely Dan junky . . . . .
I've always loved Steely Dan and that Jazzy Rock sound. Lately however, I've become addicted and can't get enough of them. I've always been a rock fan, but I'd like to expand my collection with more of the jazz/rock sound. I've got all of Steely Dan's albums and Donald's solos also. If a few of you could turn me on to some similar recording artists, it would be appreciated.