Hi, Lance. Guess what. I ended up with an RE20. I bought a few mics, in addition to your ATM25, and did a shootout of my own, with my own voice. Based on forum advice, I expected the RE20 to come in last, but it won. Go figure. Actually, the ATM25 fared very well. It's a bit too boxy on my voice, whereas the RE20 sounds more open. The ATM25's lows are great, though, which is nice for my voice. But again, the RE20 is clearer yet also does excellent lows. Unfortunately I had to sell the ATM25 to help fund the RE20 (4x the price), but I can imagine having another ATM25 someday if I ever need to mic my cabs and sing at the same time. I am also now selling
my N/D 767a (also to help fund the RE20), though I really like that mic too. Which leads me to TooNice's questions:
Sorry, I cannot make any audio clips right now because my studio is torn apart at the moment (minor remodeling). But I can tell you a little about the 767a versus the SM57. I have tried both. I have not tried the KSM44, but I did take the shootout test you mentioned in your post.
When I took the online "taste test," I preferred the SM57 above all the rest. When I bought one and tested it for myself, I found that it was a bit muddy on my voice. It was nice and full sounding, but it lacked the clarity of the RE20. The 767a sounds really good on my voice, nice and rich. However, in certain registers, it has a bit too much midrange for my taste. But it is nice and clear. The best thing about the 767a, besides its nice sound, is that it is really loud. It requires less preamp gain than the SM57, ATM25, and RE20.
I also tried the SM7, which was the loser of the batch for me (big surprise, actually, as I expected it to come in first or second). With its switches set a certain way (sorry, I can't remember which way), it sounded remarkably like the 57 on my voice. I messed with the switches some more, and my favorite setting was the one that sounded like the 57. So why spend the extra $250?
So, to summarize the 57 versus the 767a (with my voice):
SM57: Nice full sound but a little muddy.
767a: Nice and rich, still full sounding, but also a tad midrangy.
At one point I had audio clips of all of these mics -- alone with no preamp, then with the RNP preamp, then with a Great River preamp, then finally with the custom tube preamp I use with
my Chapman Stick. For my tastes, my custom tube pre blew the others away, so I returned the RNP and the Great River. As I said above, the RE20 won the mic match.
TooNice, if you can, try both the 767a and the SM57. If you must chose one or the other, I would say go with the 767a because it is louder and works better without an external preamp. I tried plugging it straight into my Roland hard drive recorder and had plenty of gain. The Shure mics have barely enough gain. When you eventually get an outboard preamp, this will not be an issue, but for now it might be.
Good luck. Hope this helps.