FirstWatt J2 on its way

What amps have you used previously with your Zu Omen DEF's?
I only ask because I have a pair of OMEN MK.II's that I run with Allnic T-1500 Integrated 300B, ConradJohnson Classic Sixty SE or a Luxman 590 AXII and have wondered what the difference in music would be with the J2?

Nyluforce sta209, B&K st1400, pioneer elite a/v receiver. Nothing with the zu’s at the level of the J2

sorry Nuforce STA200

Ok after 10 months I am loving the j2. However, I listen to a lot of electronic music and I feel the J2 is a little muddy on that type of music. Fantastic on Jazz, classical and classic rock. I'm now thinking of trading the J2 in on a Pass Labs XA30.8 (has balanced connections) or a X150.8. I may switch speakers down the road so the extra power may be nice. Both are around the same price if I purchase a demo. From what I've read, the Pass Labs amps are a little more snappy and have a wider dynamic range.