Yes you are absolutely right. Even i have been to assam, meghalaya and Arunachal. Although arunchal is not well developed and takes some real effort to reach there (getting the permit made etc.). But, believe me, its worth it. You would love the virgin mountains and the waterfalls that you come across while on the way. Overall if you are looking forward to a place away from the normal hustle bustle north-east is the right place.