Thanks for all the suggestions!
Can't really go for a cleaver. I'm 100% sure it's way too tall for comfort for me.
I have a Tanaka 165 Nakiri and the Wat 180. I like them both, but I wan't to try a more substantial version with more length and like I said a cleaver probably wouldn't work. I've heard here that the 180 is the mostly preferred middle road size and I get that I would loose some of the nimbleness that's identified with using a nakiri, but that's kind of what I looking for with the added weight and length. I also would like to see does the added force compensate for the lost nimbleness the way I'm imagining it would.
So YES, a cleaver-nakiri hybrid sounds just about right for what I was thinking about and this would be a knife just for FUN more than anything else.
The Toyoma is definitely one of THE options, but just wanted to see if I've missed anything else worth considering.