Just make sure you buy from somewhere that does a setup. My daughters both have LU-21s bought from Guitar Center several years ago ( before I knew any better ) and I can't play the things - too high action, really bad intonation.
Ohana top in my view. Personally have grown really tired of Kala ukes. Sure they are reliable, widely available, and well priced, but its seems to me that those things come at the price of losing character.
in the $100 range it might be worth looking around to see if there is an Islander MS-4 out there - that's what I paid for mine and I still think it has one of the most comfortable neck/fingerboards I've ever played.