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

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 think the choice between the .7, the 1.7 and the 3.7 aside from the cost and budget is the size of your room and adjoining open space. My listening room is 14' W x 24' L with a vaulted ceiling and an additional 12' x 12' adjoining, open dining area off to the left. The 1.7s seem to be a perfect fit in my space. I have considered upgrading to the 3.7i, but in my space, maybe a bit more than needed and several thousand more dollars.
The set up mentioned by ps is very close to what have. With the tweeter sections to the outside and toed in very slightly, the image stays very stable and on stage. Even if you aren't sitting dead center in the sweet spot, vocals remain center stage and instruments stay where they belong - kind of nice when sharing the couch with someone else not to have to draw straws for the sweet spot.
Gotta agree with ps, mostly hyperbole, I think. Over the years I've had and auditioned many very nice and some very expensive speakers; some of my very favorites being my old Quad ESL 63s and the Apogee Duetta II Sigs. I will always have a love for electrostats and ribbons. Right now, I am most happy with the 1.7s 
Jim