I like using the MXR130 as a pre-amp, too. I have noticed that there are some tremendous values on some Carver amps out there.
I have to admit that I've made these plans without (as yet) hearing a single Magnepan, but I'm going to correct that next Thursday when my buddy and I take a day trip to New Orleans. I shipped the 130 out today, so I'll have it back in about a month, I think.
As I've said before, I loved my old electrostatic speakers and have missed them all this time. I have a bit more disposable income and it's long past time to get some replacements. The loyal owner base and the long long lives of Maggies have me thinking they are going to fill the bill.
They're a lot like Carvers in that way, aren't they?