Hi, I currently have a Pentax MX and K1000 along with a Pentax SMC 50mm f/2, Cosina 28mm f/2.8 and Auto Chinon 50mm f/1.7 (I would like to replace all of them). So I would like to know what lenses you would recommend me buying? I would like to get the best lenses I can on my relatively low budget of around 35 for each lens, although I would be happy to pay slightly more for a really good lens. I have a Pentax M42 thread adapter so those lenses aren't excluded.

I am looking mainly for a few lenses that are good quality and take good quality pictures but also give me a good range in focal length, the only one I have decided to definitely try and buy is the SMC 50mm f/1.4, what is your opinion on the 135mm f/3.5?

Also, my MX has a lot of damage, including a lot of scratches and a few large dents (to be expected I suppose, I paid 30 or the camera, 3 lenses and a flash), there is also a load of marks like smudges on the focusing screen which I presume were made from cleaning it in the past, though not by me, the foam above the mirror has almost completely gone too (I'm not sure of it's technical name due to my limited knowledge of film cameras so far) this make me a bit afraid to use the MX in case the mirror breaks or something, and I really want to use it!

So would it be worth buying a new MX? I really like mine so far, especially the size and some extra features over the K1000, or would it be better for me to buy a different body like a KX?