As too the RR vs the H2 question, I'd say try them both out doing what you intend to do with it, and then buy which ever one you like. That's pretty simple. Things you may want to consider in choosing is how close the Hummer or RR dealer is to your house and how is customer service after the sale.
I do have a take on the H3 vs the H2. I had my eyes on the H2 since the day they came out but didn't get serious about them until the H3 came out. I test drove the H3 first and then the H2. There really was no comparison in handling and comfort (I had a Suburban at the time, and the H2 was much more comfortable on the highway). I bought the H2.
Since then I've spent a few days driving the H3 around as a loaner while my H2 was in the shop
. Other than a very tight turning radius (and being a Hummer) the H2 has it over the H3 in every regard as far as I'm concerned.