Had a 12 string equivalent of a D-10 once. It almost made me never want to play a 12 string again. Traded it for a mic. Have a friend with a 6 string D-10 which is the worst sounding guitar I've ever heard that wasn't meant to be a toy.
If you want to stick in the Washburn price range check out Dean guitars. Their instruments sound good, play well and look great. I've bought two, a reso for me and a beautiful flamed maple thing for my daughter.
Or, if you're willing to spend a little more, check out Martin's 15 series. Of Martin's current crop of "cheaper than standard series" guitars the 15's sound best to me. I have a 00-15 and a J12-15 and love them both.
Happy Hunting
Bruce