@elfer, the 18-250 DA is sold?

Thanks for all the info. I am still undecided if I will take the bigma with me. We are going to the north west part of the USA so it will indeed be a lot of landscapes I guess (allthough I have never been there...).
This is the first time we are going on holiday by plane, normally it is our car and tenttrailer so we normally have enough storage space (500 liters in the boot of the car and 1500 liters in the tenttrailer, so it will be a bit different for us this time )

I just found that the Tamron 18-200 3.5-6.3 is dirt cheap, is it any good? It's €165 at the moment.
A Sigma with the same specs is allmost €400

We are going on a camper trip in the USA next year and because of the luggage limitations I am considering a 18-250 lens for my K20D but I really don't know what to get. The budget is max €400 to €500.
Normally I have my pentax 16-45 and 50-200 with me but a single lens would suit me better since I am also planning on taking the Bigma along for the ride.

The pentax Li50 has a higher rating but in practice there wasn't much difference.
I never used the original Pentax charger however, I have a Hahnel Twin-V Pro which can charge two batteries at once and it works perfectly. I bought it because it has a 12V input so it can be used in the car.

There have been numerous discussions about the quality of after market batteries for the K20D (and other camera's).
When I got my K20D in 2008 I bought a no-name NP400 as the second battery for my K20D.
It has worked flawlessly until this summer. I used the Pentax and no-name alternately and they have seen the same amount of use but the no-name is now almost dead. The Pentax one is still going strong.
So I will look at the price difference again and if it is still less then half of the price of the Pentax one I will get a no-name again I guess since four years is good enough for me

The toy lenses are a range of lenses to mimic the effect of toy cameras. They allso have normal lenses as far as I know it.

Yes you do. The difference is that with the older firmware the rear curtain sync did not work with the K5/Kr.

The Dutch spec sheet on Pentax.nl does say 16 segment metering.

They have more or less acknowledged that there was room for improvement for the motor zoom part of the 58. They redesigned it for the 58-AF2.