Unfortunately, the earliest "pure" Walsh designs (models A & F) are no longer serviced by Ohm. They have made adapters for their newer "cans" to be mounted on the old cabinets, but that doesn't yield a very similar speaker.
I'm still wondering why it seems people here are comparing $599 Magnepans to $2500 dynamic speakers. Wouldn't it be more fair to compare models of similar price? Ohm's least expensive floor standing model is twice that much! ...and that's Factory Direct price! Magnepans will always be somewhat limited in dynamics compared to cone speakers with cabinets. Just like any other panel, their dynamics is a direct factor of area, and with such limited excursion, even a huge panel is going to "run out of wind" (making them sound "compressed") at very high peaks. My Tympani had over 16sqft of area per side, and even they had limits, but those limits were Very high... higher than I needed, so effectively for me just fine. My local Magnepan dealer happens to carry Vandersteen as well, that's where I've heard the 2ci most, and I've listened in on straight "shoot outs between MG20s, and Vandersteen 4s, and in that "living room" sized listening room, I don't think impact, nor dynamics were a limiting factor with either one! FWIW, The customer was an uncle of mine, and he ended up buying Vandersteen Quatros - he LOVES them.
Like I said before, I'm a big fan of the whole line of Walsh speakers, but I do think it's important that you consider competitive models, not just brand vs brand.
...also, to clarify my comment about Ohm's dynamic limit. I simply found the sound Quality suffered a bit (particularly in integration between mids & highs) at their highest levels. I don't think they are particularly "fragile", or likely to "melt down", and as long as you choose a model that will play in the volume range you find necessary, it isn't of too much concern.
Cliff