bossman, everyone is going to have their own preferences and I know more about the Metrons than the Izors. However in terms of recomendations, being an intermediate, you might not know your preferences yet (balance point, turn initiation, edge grip, etc) so I would instead follow a couple guide lines. For intermediates, I think like buying shoes for a kid, you want a good fit that will properly support while providing a bit of growing room. For an intermediate looking for skis, I would say, don't go longer, but look at skis geared slightly higher than your current level (growing room - however, you have to be honest with yourself). Proper length is subjective, so go with your comfort, possibly +5cm or so, going too long at an intermediate level is one key way to plateau or even backstep your progress on the snow.
Now the interesting thing comes into play, platform (or in ski terms waist width/design). Being slightly larger than most skiers, you will be able to put more presure on the edge than someone smaller than you so tortional rigidity comes into play a little being an intermediate, you might consider something slightly less tortionally stiff (twisting - Atomic tends to be very tortionally stiff), but possibly a touch stiffer longitudinally (up and down flex) the reason for this is you will naturally bend the ski more with your weight, but being an intermediate, a tortionally stiff ski might feel like it only wants to rail (might feel like the edge locks). Interestingly enough, I would also bring ski weight with flex patterns. A lighter ski might feel "flimsy" being a bigger skier, I would go with something that has a little more weight to it.
You also say that you will have a trip west and I'm assuming you are not looking to build up a quiver, but find a ski that will perform in the mid-west as well as west. That being said, I would look at a ski with a 70-85mm waist. I am originally an east coaster, and from my experience, I couldn't feel much difference between 60ish-80mm waists, other than a slight difference in grip and edge speed. Once you start going over 80mm waists, you might feel the width of the ski torquing your knees (the ski not wanting to be on edge and trying to flatten itself back to the snow). Around 80mm waist should provide a comfortable platform for both mid-west and west skiing (maintaining a narrow enough waist for the mid-west, but providing some float in western conditions).
With all of this said, I think looking at the Metrons might be a good starting point.