^F3 bodies have become the bargain of the decade... You can get them for the same price you'd pay for an FE2. Sometimes less.
The main reason why the FM2 has held its value is due to it taking over the cult camera status from the K1000. Remember how K1000 bodies were going for almost $200 a few years back? Now they're back down to a more reasonable level. Now, the FM2 bodies are back up into the $200-$300 range.
The FM/FE series are pretty durable, but I'd have to say, not as durable as a Nikkormat FT series body. I've had some real ugly looking Nikkormat FTn/FT2 bodies over the years, yet, most of them worked fine. I haven't had the advance ratchet cams fail on them, nor the tripod socket get torn out of one, like what happened to a couple FM2n bodies I've owned. In fact, right now, my current FM2n is being overhauled. Ratchet cam no longer locks when the shutter is cocked. Since it is an FM2n, it is being repaired. If it had been a Nikkormat FTn, I probably would've parted it out by now. Cheaper to buy another body.
-J