they all have the features i'm looking for:
preamp output on all channels and
various Dolby/DTS decoders.

i'm not very keen on the Yamahas either; the decoder i have now is not very good quality: i took it to a tech. a couple of months ago for a check up. As an example, there is a rotary switch to select different modes (Surround, Hall, Music...etc) and i always had problems with it.
i asked the technician if he could disable this switch and install one just for 2 functions: Surround and Bypass.

he said that the switch has about 40 connections and they're being eaten up by the current passing through, and when it stops working, there's no way he can install another one as replacements cannot be found anymore. He also said that when that will happen, the whole thing will be good for scrap.