Antonio Banderas - I have enjoyed everything I have tried from this house, some more than others.
Tommy Bahama - To my knowledge, they have 5 major releases for men. I own 4 of them and enjoy them all. St Martinique, there latest release (and hardest to find), I recently acquired a sample of, and was not impressed. Basically a rip off of Nautica Voyage with some added musk.
Diesel - Many of their older releases get little to no love.
Dunhill - A few from this house that I find horrible, but, the ones I do like, are outstanding.
Tim McGraw - This house has only 4 men's releases, to my knowledge, 2 of them are amazing, and 2 are just nice.
Vera Wang - Granted there is only one men's fragrance in this house, that being Vera Wang for Men, I think it is an amazing one. I wish projection and longevity were better though.
Zirh - 3 great men's fragrances, low prices.
Honorable houses to mention, but may not be underrated:
Bvlgari - Maybe this house is underrated really, Just Black gets all the attention. There are a lot of great ones in this house.
Burberry - Another great house, and like Bvlgari, they make beautiful bottles too. Of course, London, being their most loves here in the fragrance world, while Brit is probably their top seller. I'm not a Brit fan; but London, Touch, The Beat, Summer version 2009, are all great ones.
Slumberhouse - Although I have only tried Norne (and was blown away) - I can tell based on reviews, and comments from friends, that this house has some good stuff, I hope I can try everything soon!