Olympus E-M1 w/ 12-40 as a travel camera?

Hi all,

I will be travelling for 3 months in Asia at the start of the new year. I am looking to pick up a  kit that is light weight (relative to DSLR), weather sealed, has accurate AF and plenty of physical controls/customization options.

I currently shoot a Pentax DSLR with a 16-50 2.8 lens that is weather sealed. However, the Olympus EM-1 with the comparable focal length 12-40 2.8 weighs 13 ounces less and would allow me to bring a more compact tripod as well for travel (looking at the MeFOTO backpacker).

I am thinking of buying the EM-1 with the 12-40 2.8 to complement a Ricoh GR and a 20mm 1.7 pancake lens that I already own as a travel kit. Would you recommend a different combination instead of the Olympus M-1 or lens? Any other lenses worth looking into for travel photography? My budget is around $1500 for body and lens (I plan on buying both used).

Thanks!