i have yamaha and love the sound, especially for home theater. onkyo has a good rep as well, but each has a different sound. yamaha has a distinctive "clear highs" sound; many like it, some don't.
that yamaha only has one optical and one coaxial digital input (the original text description is wrong) . you may not think you need it now, but you will regret it later. the onyko has 2 optical and 1 coaxial input, not that much better but a little better. both have componenet video switching, which is good.
don't worry about wattages. these brands, especially the yamaha, rate their power much more conservatively than kenwood, pioneer, sony, etc. These are probably comparable to 90- 100 watts of the other brands.