I'd love to have a Martin, but my Larivee 6'er might get jealous (and my bank account/Sr. Management would probably have some objections as well). I've also been wondering about the feedback issue, but I seem to recall a couple of manufacturers who sold inserts that would dampen the sound hole on an acoustic (which I seem to recall having been done with a coffee lid and masking tape by a few folks as well on the uglier DIY side of things). If I ever needed to play out really loud though, I'd probably consider it.
Those Godins also look pretty nice, but as you say, there's still the financial issues to be overcome.
Thanks guys, I certainly appreciate everyone's responses.