I listened to the audionote mitsu se, line magnetic stuff and two custom units before setting my ears on the finale audio amp. Just does everything better most noticable was the extension on the Highs and lows. Put good tubes in these amps they want them. Others also mention the Frankenstein amps as good choices too.
I'd be happy to go into more detail if you'd like let me know. Can also see my big red one in my profile pics. Note mine is in a larger chassis then the current production.