Hi I have a U100 + HD239 connected to my PC. I just bought a T90 and thinking of adding a amp. What is your recommendation, should I get a A800 or A100

Sound System : HTZ-373DV DVD-only system boasts five 60-Watt satellites, a 60-Watt subwoofer, 30-Watt ‘central speaker’ 5.1+1 system covers a range of about 82Hz – 20kHz   TV : Sony 40 inch Full HD Ex400   Digital satellite TV Receiver 

Hi All,   I am considering between RS 180 and HD 650, the price is about the same. Which model do you all recommended. Thanks you all in advance.   Because I can only afford to buy either one only, so it is important that i do it right.