Hi Max,
You might get more responses if you asked this question in the lens forum
If I were you, I'd keep the two M primes and well the rest of the lenses. Our lens databases (
Pentax Lens Review Database - Lens Listings for original lenses and
PentaxForums.com Third-Party Lens Review Database - Lens Listings for third-party lenses) might prove helpful as far as pricing goes, and you can also search our Marketplace archives.
Adam
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