Over the years I've accumulated cameras (a result of GAS...) from thrift stores, ebay auctions and stuff like that (3-4 SLR bodies, stuff like Pentax ME and Canon AE-1), and it really doesn't make sense to have a bunch of 35mm cameras with different lens mounts and with just a nifty 50 for each one. I think the more wise decision would be to sell them and just have a single SLR body with a few lenses to choose from. The good thing is that I can probably get a little more for what I paid for them a few years ago, so it's not all bad. I've narrowed it down to these two models and I can't choose between the two. The Pentax MX is more affordable (upfront cost for the body seems to be the same as the Nikon FM but the lenses are a lot cheaper) but from what it seems, the FM seems to have the edge over the MX and just pentaxes in general as the more reliable and all around better built camera.