The M39 is a very good mic. Period. You do mean the 39 and not the 37, right? The 39 is just plain solid, versatile with its patterns and pad, and very clean. Kinda hard to find these days (at least under that name, the 179, though, can be found rather easily. it's the same mic, if I understand it properly). used to go for about 300, I think. If I could get an M39 for 130, I'd certainly jump on it, and ask if I could get a second while I'm at it.
I've gotta say, though, I've been on such a CAD kick lately. Quite a while ago, I was enamored by what I could get with an E-100. Nowadays, I'm just loving my friend's M179s, and I'm rather fond of my stereo matched CAD GXL1200s...