I went with the K200D as my travel system and those lenses you mentioned will be in my bag by year end but the kit lens 18-55II and 50-500 have been quite good thus far and most likely i'll end up getting another K200D as backup.
This is strictly my travel gear, i'm no pro but chose based on AA power, i do primarily street and architectural images, people are always in them. Buffer and fps wasn't a concern and i'm quite happy so far with the controls both auto/presets and full manual. I'm still testing the limits of the camera for what i shoot and nothing negative so far except although it's weather sealed the manual recommends no climate lower than "0"c, this might be why going over the Golden Gate Bridge in an open top bus the body froze and had to be warmed in jacket before shooting again, missing a lot of interesting shots crossing.
Winter is coming here in Toronto, so i'll be out and testing, i'm 80% sure it wasn't the body but just the batteries that froze, i have since gotten a vary of different batteries to test for the cold climates.
This is my first digital Pentax, the last Pentaxs i used was a 645, 67 and MEsuper in different time frames though.
10D or 200D either would be good as a studio/backup camera.