Check evil bay, there's a decent looking '84 WR400 on there (I don't know the owner or bike). They are an awesome engine, one of the best. I've had all models & sizes of Huskies, but the pick of them for me is any of the 390's (especially 1980) & the '84 WR400. All Huskies are good though. Kato's are also good, GS 350/390/420 are nice but a tad harder to live with than a Husky.
K