lens selection

I am headed to Europe for a month and I will be taking a lot of pictures. I am trying to figure out what lenses I should take, so if you have suggestions I would love to hear them.

These are the lenses that are in question right now. I really want to try to minimize the number of lenses I carry around if possible.

My camera is a Pentax K10D.

Sigma 28-105mm f:2.8-4 – this is an autofocus lens that takes pretty good pictures and is probably a pretty good walk around lens, but is surprisingly poor in low light conditions and suffers from CA.