There's some bias here, some more pointed than necessary, but so be it. I personally have zippo against Ray, own one of his amps, and if he came out with something I liked for a reasonable price, I'd get it, though that doesn't seem to be happening.
I listened to the Apache at the Florida meet, have heard the balanced Beta on two occasions, a balanced Dynamight multiple times, and quite a bit of balanced headroom gear from the old Blockhead to the latest as far as ss goes. As I said in my meet impressions, the Apache did nothing for me, and I tried with with R10s, 600s and 650s. Not bad; just nothing. I also have no affection for the Meridian. If it pleases you, that's great, but it's difficult for those of us who have heard it, and don't share the same opinion to not put the differences in the pot when you're talking about headphones heard from that rig. I'm not a D5000 fan, but I've heard it from a few different sources/amps and I didn't experience it as you did. I am a L3000 fan and same deal here.