I just went through this and ended up with a Montbell Peak jacket. The Integral Designs eVent jacket was another option, but I didn't like the way it fit me. The Montbell is a very simple, sleek jacket with a good hood, two large front pockets, and huge pit zips. The fabric is rated as more breathable than PacLite Goretex, IIRC, and it seems substantial enough for long term wear with a pack (though of course I have only had it since November.)

Hope you have a great trip.
--Ken B