Thanks for all the replies. Since I was in a business trip, I was not able to reply the posts.
My favorite receiver list is,
Yamaha 5890,
Pioneer 56txi
Pioneer 54tx
HK 435 and 635.
But I removed HKs from my list because I realized that usually HKs have HW problem I mean that it seems their quality is not good enough.
Actually, power is not so important for me. Since I live in an apartment, I am not able to use all power of my speaker or receiver.
The important thing for me is very good automatic speaker calibration or set-up and good quality.
I know that 56TXi is very expensive but it looks very attractive. On the other hand I may push my budget a little bit more up(1 or 2 hundred bucks).
I do not plan to buy refurbished one.
Denons are good but they are more expensive.
The rest of the features such as DSP, Pro Logic etc. seem common for all receivers.
I forgot to say that my current speaker system is 5.1. The receiver I will buy should allow me (it it is 7.1) to use it as 5.1.
