Originally posted by Lore Tamron 17-50mm 2.8
Pentax SMC DA* 60-250mm f/4
Pentax DA 35mm Macro Limited Lens
Pentax FA 77mm f/1.8 Limited
I'm not sure we should take this thread off-topic -- ha ha ha!
I am more a prime person so would take a different approach. I have the primes you mention and they are excellent lenses. I do not use the DA35 as much as I might otherwise, since I have two other macro options. I consider it more a good walk-around lens that just happens to focus arbitrarily close. If someone wanted just one lens and liked landscapes, urban candids and flower shots, while requiring auto-focus, it would be my number one recommendation.
But it is largely redundant if you are planning on the 17-50/2.8 as your general purpose lens. I would go instead for a longer focal length macro, if you think you need one at all. (There are several good choices depending on whether you want AF.) Or even a diopter adapter for the end of the FA77. That works well.
Instead, consider if you might want something faster for special use. If you don't mind manual everything lenses, the K50/1.2 is insanely good value. And you can show off the fast aperture to your Canonite friends. I know I do.