Yeah, I should have been more specific in my first post. I'm looking for something that I could carry with me "just in case," as well as a quick "hey I'm going to/playing a show tonight, maybe I can get some good recordings." For anything heavy-duty or that I want real pro audio from I've got a laptop recording setup that I can lug over, so I'm not looking for show stopping audio. I'm mainly looking for something to record the concerts, jam sessions, buskers, open mics, etc. that I go to anyway, so that I can go back and enjoy them again or share them. I also do some radio work, so it would be nice to have something I can throw in a bag for quick interviews.
P48 is actually not as big a deal for me, as I have a couple of plug-in power mics and a battery powered AT omni. Obviously, I would rather have it than not, and I do have some mics that require it, but it's not a do or die feature. For me, I feel like the M10 is the right size, but I'm wavering over the fact that it doesn't have XLR in and the fact that it only has 1 input, as well as wondering if the 661 is enough of an upgrade in overall quality to justify the price. I don't want to buy a recorder, then want to upgrade a year down the road.
-Tyler