The only lens I have for my k20d right now is the pentax SMC DA 18-250mm F3.5-6.3ED AL. Seems to be a pretty good overall lens which covers a lot of what I am shooting for now.
I have been a Mopar nut my whole life and have never had a reason to want anything else (except a nice german luxury car but who wouldnt want one right?)

just visited to see what lens you used on flower pics All the Best Dave (I"m a Mopar man and my wife Susan is definately a Mopar woman)