I really cannot choose between both. Italy would be awesome, Pacific can be gold too. It will be very biased to ignore any of them. I also can't vote that i prefer Eastern front over others... i just want them all!
But to say, which one first, my answer would be Italy. I want maps featuring Western Allied tanks vs Late German Equipment map! Which is possible in Italy. Normandy is a bit lacking, since we don't see any more or less variety of German vehicles than in Italy theatre. IMO, the best balance is there. Since i love North Africa's equipment so much, and feel that the axis is a bit underhand, the Italy theater, featuring more advanced earlier versions of late-war Italo-German war machinery would be very interesting.
I see prospect for Pacifics only for its environment change... e.g. more tropical jungle/beach than sand, snow, tundra, pine forest, or farm hedgerows.