Think I went thrrough this earlier today and it was concluded the 2308 does not do MA. If that is the case you need to cross that one off the list. I like the pioneer but you are correct that the 91 only goes to 480p you need to get the 92 to get 1080p upconversion. For the price the Onkyo is hard to beat. I have just heard they run very hot so you need very good ventilation.
I know alot of people here have problems with AVS and the Blu VS HD junk over there but check out the amp section. You should find reviews of all of these there.
Good luck
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