35mm f/2 or 17-70mm f/2.8-4.5?

It's for a Pentax K100. The former is $60 cheaper. I'm pretty much set on between these two, but I can't decide. I know that I won't be doing a lot of portraits, and I could use the extra length.

 

Apples or oranges? Apples are $6 cheaper?

 

So you don't want to do much portait... what do you want to do though?
And what lens do you have now?
(did you consider the 40mm f2.8 limited?)