My vote is for the Yamaha. I've been looking at new receivers for several months, myself. The new Onkyos have a lot of features and are probably the best bang for the buck. However! The heat issue is a big negative to me. I don't have much room above where the receiver has to go, so high heat is a deal (and probably receiver) killer for me. Couple that with the fact that it's really hard to find anything negative about the Yammies, and my decision was made. It also helped for me that the Yamaha had an extra HDMI input vs the Onkyos. I went with the 3800.