The FM is pretty redundant in light of your FM2. Don't worry about batteries - they're cheap, light and small. Shutters lock when the advance lever is closed.
Unless you have a pressing need for another body now I suggest waiting for an FE2. Why? Two extra stops of shutter speed (to 1/4000), TTL flash (!), flash sync to 1/250 (vs. 1/125 for FE), flash compensation is a breeze. I have all these bodies except for the FE, which I gave away - much prefer the FE2. Prices are comparable. I've never noticed differences in shutter vibration but the FE2 has improved mirror dampening vs. FE. FE2 is the 'new and improved' FE!
Last edited by Aja B; 12-10-2013 at 11:06 AM. Click to view previous post history.