I know you mentioned a wood body resonator, but I did play a pretty good metal body resonator at McCabes a couple of years ago. It was a Regal (I'd never heard of it before) and I think it was a knock off of a National Tricone (I can't remember though).
I played it for about an hour and liked it the more I played it. While I'm generally squeamish about "cheaper" guitars (I think they wanted $500 for it -- not too cheap when I think of it), the reality is setting in that I will never be able to afford a real National.
They might make a wood body, but I have to say that I think I'd rather have a metal body guitar for
slide. It might be a brand worth looking at.