I use Sunfire 300. It replaced Bryston 3b-st. I purchased it nearly new on ebay $417 shipped and than sold my Bryston 3b-st $~1200. Not definitely higher end, but the price of my unit used is actually higher now than I purchased new. I wanted actually to go for Sunfire 600, but never got the chance to upgrade. The Sunfire 2ch amps had always been called "lower-end", but by all possible means they're not. They sell now at the same price point as Krell KAV250 amps. That tells I guess something about the quality of these.