Holy Cow... I just got off the phone with Doug... after 20 minutes of me asking questions and him answering them! He is one really NICE and KNOWLEDGABLE GUY.
I can see where he got his reputation... I asked him everything I could think of and he answered it all.
He did say "no refunds" but he also said that I should put the ACM 660 up against the stock 670 and be prepared to be blown away! Doug even said that the 660 STOCK will blow away the 670 stock! He also advised me to dump the MixPre right away 'cause running a MixPre line in on a 660 would sound WAY worse then running the ACM 660 MIC-IN without it.
I then asked about getting the 671 stock and running that via a MixPre and he said the ACM 660 will STILL sound better... but he also said that if I buy the 671 from him that I can always send it back later to get the mods (once they're ready).
Then I asked about the room acoustics I hear in the test recordings and he assured me that those are low frequency artifacts and other electronic noise bringing out the room whereas on the modded units you don't hear that and THAT'S why the other recordings sound so much closer... and he said he gets asked about that a lot! I still think it sounds like the room, but the previous point that he'd lose reputation if the end user didn't also experience this effect is a good point... I'm almost totally sold on the ACM 660
JUST for that alone! Bringing voices up close and intimate is a powerful tool for somebody who just wants dialog!
So what to do, what to do. I got a lot of thinking ahead of me today... and probably tomorrow... and the first thing I'm thinking is I'm going to cancel my MicroTrack... so that once I decide I can get one of these other machines from Doug.
Thanks for all who put up with my shit and replied. Doug seems like a good guy to have on your side.