I started with an M3TS and now have an M3TM and have used a bunch of amps, all of which sounded good, though of course some were better. Power from 3.5 watts to several hundred - lower power can sound great, but bass needs some horsepower - I use a couple of GR Research servo twin 12" OB subs and they work fantastically with the Spatials. Currently, for amp I am using a 35 year old CJ MV75a1 and love it - these can be found for abt $700. Using passive pre - Tortuga - maybe $500 for used one - the Tortugas sound stunning. Then find a nice used DAC for a couple hundred - they all sound very similar to me in this price range. This combination, even without the subs, can be very pleasing.