I suggest 18-55mm kit and Sigma 70-300 APO DG as tele. You loose quick-shift and 15mm range but you gain Macro 1:2 and much lower price compared with the 55-300 from Pentax.
anyway, after LBA kicks in
, you'll probably buy a 17-70mm (or similar from Sigma/Tamron) which is much superior to the DA-L kit so the 15mm will be covered.
Another do-it-all option would be the 18-250mm which basically covers all needs (with some compromises, but better than kit lenses) and pair it with a nifty-fifty for low light and you're set