GMA Europa owners use what amp?

I should have emphasized that I have no complaints about the Edge equipment. My happiness is of a completely subjective nature having to do with the preferred equipment, not in the fact of having rid myself of Edge gear. Edge Electronics is a first class company with commensurate people and equipment.

I've driven mine in 3 configurations - in my primary system I have B&K M200 Sonata monoblocks. I've also used them for the fronts in a HT system driven by a B&K AV5125. Finally, I tried them with a Bedini 100.100 for a bit. The best result is with the M200's (as one might expect), though they are quite satisfying w/ both the AV5125 and the 100.100.

I'm trying to build a Tube rig now around the Europas. It sounds like I can anticipate good results. I haven't decided on an amp just yet.

For my tastes, and in my room, the Europas must have a sub. I'm running a Rel Storm III.

I use a Densen B100, a minimalist SS design which has been described as SET like mid-high with SS bass in reviews.

Roy uses and recommends EDGE amps ... also a minimalist SS design. Having seen an EDGE integrated with the lid off it looks almost exactly like my Densen inside .... big power supply a minimal signal path.

The europas are pretty revealing, so I would expect harsh SS designs would be a bad partner, and tubes could work very well.

In my opinion you need to budget for sub. I run my Europas with a REL strata crossed at 50Hz and it's a great combo. Without the sub the Europas would struggle on rock and orchestral music.

I also run mine two ways:
For HT, Sherwood P965 with Adcom 555II (yeah, I know!). Very dynamic, but a can be a bit harsh.
For music only, a Cayin TA-30 really makes music, even with only 35 watts/channel. I have a fairly small room, 13' x 13' with 7.5' ceilings. Volume rarely goes above 10 oclock. I use a sub only for HT, in this room bass response is pretty impressive even without.

I own the Callisto and Cary products seem to be a great match for GMA. I use a Rocket 88R and I am very happy with the results. The Europa should sing in the same manner.