I have had Moabs for a couple of months now. Sold my 3.7i shortly after getting the Moabs. Don't miss the Magnepans at all. The Moabs are special.
I also have Eminent Technology LFT8b, which I feel are the equal or better than the Magnepan 3.7i. So if you want to consider a less expensive option, I would strongly recommend the Eminent Technology over the Magnepan 3.7i.
@jlarryk thanks. If planar is the answer, categorically, I will be sure to check out ETs. The fact that you don't miss the 3.7is now that you have Moabs is very interesting. Did you not sense the loss of any soundstage, transparency, cohesion across frequencies? What types of music do you and did you listen to in both, if you don't mind me asking?