THANK YOU, THANK YOU!!
Great information and just what I needed to hear. The Zebest looks to be in the best shape (of the cranks), but I was worried about the quality, though the seller says he uses it a lot.
I knew the Ektelon was the best brand, but was concerned about the age, but again, it's been put to use recently, so I guess it's functional. He said he has to add a pound to get the tension right, and that there's a little rust on the crank arm. Should that be a warning?
Then I was deciding that the newer Gamma might be the way to go even though I liked the ease of learning on a crank.
Thanks again for your help. I'll be sure to be around asking a lot more questions with pictures of my 'new' stringer!