Which crossover are you using? minDSP or Antimode 2.0? The Antimode is probably a much better unit then the miniDSP (as it’s 6 times as expensive, lol.), but keep in mind it is still a DSP (which means A/D -> DSP crossover -> D/A). If you like the way it sounds, I’m sure it will benefit strongly from a hefty 12V linear power supply such as this:
http://www.ebay.com/itm/121970182193?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Or many others that are available. It's hard to say if this will be better than a Bryston crossover, but I know you're trying less expensive options first.