musical fidelity a5 or simaudio i5.3

i need amp with home theater bypass and have listended to these two. this is for a room that is 20x19x8 with lots of windows and hardwood floors with rug and paired with Dali ikon 7 and a rel sub to be determined. i like them both and found the simaudio to be more detailed but like the $500.difference in price to the A5. i listen to classic rock,electronic,some blues and jazz and at night like to listen at low levels. what might be a better fit for this time of room and music?