Originally Posted by w6wat
Well....you can spend lots money to cover that range or.......you can just pick up the kit lens, and the 50-200. You won't cover that 15mm range, but you'll be close. The DA 18-55, and the DA 50-200 perform spectacularly for their prices. The build quality is quite good in terms of lightweight materials and a metal mount.
I've got some images posted here:
Kit lens surprises!
when someone asks for the best, they probably want the best
..until they realize the price
The best are listed, the cheapest are listed, here are some other good options:
Pentax 16-45/4
Pentax 50-135/2.8
Pentax DA200/2.8 (not a zoom)
Tamron 28-75/2.8 (highly regarded)
Sigma 24-70/2.8
Pentax 14/2.8 (not a zoom)
upcoming lenses to watch out for:
Pentax 17-70/4
Sigma 70-200/2.8 (LOOKS NICE!

)
Tamron 70-200/2.8
Do your research before you buy, and decide what you actually need most. For myself, I prefer to buy glass that won't be "replaced" later on by something else of the same FL, but getting the kit lens(es) is a good idea to see what you need.