Both of those should be fine. Don't worry too much about wattage with either of them especially if your receiver pumps out up to 100 watts. Unless you're buying the 800 series the wattage won't be that much of an issue. I'm running the 604's off of a Yami 1400 and they sound find eventhough they are in a bright acoustical room. I haven't had a chance to put anything on the walls yet and it is a 12 x 17 room. Usually, I try to listen in the -20's to the mid - teens. At that level I still don't think I'm using all the wattage from my receiver. As everyone has stated, don't forget to listen to some of the other brands. PSB, Totem, JM Focal and Paradigm to name a few.
Bryguy