More 2nd lenses... Which are worth buying?

I just spotted a 2nd hand seller with the following lenses for sale. From the photos they look to be in pretty good condition:

- Carl Zeiss Sonar 135, F2.8 (Contax mount) --- $145
- Carl Zeiss Planar 50, F1.7 (Contax mount) --- $120
- Canon FD 50, F1.4 --- $235
- Canon FD 35-105 Macro, F3.5 --- $135

Which would you go for first if any, and do you reckon I would lose too much quality with a converter on any of these?

Thanks

EDIT: Thought it would be useful for you to know what I have already... I'm just tempted by the whole prime thing. I have the following lenses in stock:
- Stock 18-200
- Sony 16mm
- Sony Wide angle adapter
- Canon EF 24-70 2.8L
- Canon EF 70-200 2.8L II
- Canon 100mm macro 2.8L

Maybe the 2nd hands are more nice to have than need to have?
 
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Get the Contax lenses fast- those are great prices. The FD 35-105 is good but it and the FD 50/1.4 are over priced there.

good luck! Buying lenses is fun and addictive.
 
That 50 FD is so far from over priced it is ridiculous. No matter what condition, I got mine in PERFECT condition for $60... Unless it is the L (which I doubt because the L is f1.2...)
 
Yay... i got them both and a lens hood for the 50mm for $320 incl. delivery. Hopefully I'll have them friday. Will see if I can put together a small negligible video with them.

I see now that I calculated the wrong dollar price for the 135mm, it was really 195. Hope that doesn't change the deal too much. I could always resell it.
 
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