Originally posted by tax
I found Tamron 28-75mm F2.8 SP XR Di LD A09 to be a very good all around most useful starter lens. Especially for tourism and traveling. It is fast, F2.8 through out its 28-75 focal length, light and relatively cheap, if you buy a used one in mint condition. The only minus, it is not weather resistant, but it does not cost thousands of $$$ either.
this is the best value for money for K1, some photos:
Tamron SP 28-75 2.8 Macro A09 | Flickr
the others FA 43 , DA 40 ,DA*200 and FA*300