You probably won't go wrong with any of these on a pentax body. People complain all the time about them on Canon because of incompatabilities, but luckily pentax doesn't have this problem.
I have the 18-50mm and it's a good lens but a little prone to flare. Use the lens hood religiously. I needed the wide end as it is the lens I use the most. Honestly, I probably would have picked the 24-70 and make do with the wide end (and enjoyed the longer reach for portraits) but it is substatially bigger and I didn't want to have to haul it around all the time. The tamron on film would have been the better lens but 28mm for me would be not wide enough for a standard zoom. 24mm is barely there.
I picked the 18-50 for size, weight and the wide end (I have a 100mm F2.8 for longer stuff anyway). BTW, an F2.8 zoom is nice, but if you are looking for low light performance, get a fast prime - F2.8 isn't really that fast.
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