Hi which amp would you buy , i have a dead pioneer a400 and fancy a change , looking at the marantz pearl lite /arcam fmj 19, roksan candy,or rotel 1520, i listen to rock and pop in a room 16x16 i have a pair of monitor audio bx5 and a marantz cd 6004 which do you guys think would go best i will audition when i narrow it down ,also use ipod through cd player thanks.