How is the 17B rated as a collector item? I understand it doesn't use RPN. There is one on a popular auction site and it appears to be in good condition.
I like it because it is the "sister" to the 27s - which is my favorite HP. It has a similar user interface, similar Solver, but with a different set of functions.
I don't particularly like RPN, and that is one reason I like the 27s. But be advised that the 17b is really "chain logic", not algebraic. You can force it to algebraic by using the ( ) keys.