The two takumar F's you're referring two aren't the cream of the crop, so if you decided to sell them, you'd only probably get a hundred bucks or so.
Takumar-F 70-200mm F4-5.6 Lens Reviews - Pentax Lens Review Database Takumar-F 28-80mm F3.5-4.5 Lens Reviews - Pentax Lens Review Database
Your DA lenses overlap with these, and have better IQ, so I guess you don't really need them. The sigma zoom is nice, but you're already covered from 18 to 300 mm.
Adam
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