I would go with the EMR II for sure. The Nomad was designed to be extremly versatile, but 7 days (depending on gear) is about the top end of the pack. After that, you'd be much better off with the EMR II. The longer trips you describe, would be the exact thing that this pack was built for, but also a hell of a day pack.
We actually designed the EMR II (didn't know the name yet) before that Nomad and the base idea of the Nomad came from the wings on the EMR. The Nomad will give you a better/sleeker day pack, but the EMR will give you a better extended trip pack.
The downside of the EMR compared to the Nomad is the # of options you have with the Nomad. You can run about 20 different configurations with the Nomad and get it EXACT for your particular hunt. With the EMR, you only have a few, but do have a much better pack for longer trips and big loads.
For me, I'll be using the Nomad for scoutng trips, day hunts and rifle hunts. Anytime I'm dong a backpack hunt with a bow, I'll be taking the EMR.
To give you a direct answer for your situation, GET THE EMR.