I have heard Sim gear with JM Labs. The sound was a bit on the lean side for my taste. The combo was pretty good. I may not be the best person to comment because I am not a big fan of the JM Lab sound.
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I´ve had Moon W-3 driving my Mini-Utopias with good results. The amp is powerfull with plenty of distinct bas and nice midrange but may be a little lean in upper treble.
Although I´m not 100% shure wether leaness come from amp or speaker. Sound is very detailed even at small levels and runs in classA first 5 watts.
I now use Jadis (second hand) tube amp and it helped take away some of the leaness. It was a recommendation from an audio retailer. Cables can also make a difference.
Utopia are of old version without Berrylium elements for treble, don´t know if Minis ever where produced with Berrylium. I kept Minis for their exellent: monitoring/soundstage and ability to play loud without affecting sound quality. I also have SubUtopia (active