MMGs

Kythyn, I have a set of Maggie 1.7s in a room much the same size and configuration as mentioned by johnnyb53. I'm driving them with a Rouge Cronus Mag. II 100w per side integrated tube amp and it has no problem driving at any level I can stand to listen to - I listen to much the same styles of music as you. I also have a ADCOM GFA-5500 and with 400w per side @ 4 ohm, it has no problem driving the 1.7s. After 8 or 10 good hours of warm up, the ADCOM sounds pretty darn good with the Maggies, just not as sweet or open as the Rouge.
Just a thought - go for the 1.7s or 1.7i (around $1,200.00 used) go with your Adcom GFA-555 (300w per side @ 4ohm I believe, should work fine) for now and upgrade your amp as you can. 
Best of Luck,
Jim

the A23 and Odyssey Khartago have been around a long time. You can find a good A23 or Khartago Plus for around $600

JHills,

Thank you for your recommendations, I will go listen to the 1.7s this weekend.  The room feels like it wants more speaker, but that could be just positioning.

Johnnyb53,

If I pick up the Halo A23, what preamp would you suggest?  I am currently using a Schiit SYS passive amp because the Onix XCD88 CD player has a high gain.

A thought on the DWM panel - base  below 60 HZ is non directional and placement, as long as the filter is set at or below that, isn't really critical. I am not particularly familiar with the DWM panel but I am using a ADS Sub 12 with my 1.7 and It integrates very well, as it operates only between 20 - 60 HZ. icanskate mentioned a PSB sub that also integrated very well. Some believe that a cone woofer isn't quick enough to integrate with a ribbon or electrostat panel. The truth is - there is nothing quick about 20, 30 or even 40 HZ; it's all about producing those low frequencies and moving air in a given amount of space. I believe that the DWM panel/panels would work well and should be fairly flexible with placement as long as operating below 60 HZ. The 1.7s have a very good mid base down to about 50 HZ so any quality sub used only to augment frequencies below that, should work very well, with a minimal amount of critical placement.
Jim   

I had the MMG's not too long ago and shortly after purchased the bass panel which I did not like at all. 

At all. 

Waaaaaaay too many wires running all over the place.  

I suggest a REL subwoofer. My room is 14 x 24 and the small 8" REL was sufficient enough.  Better hook up than the bass panel, too.