That is a very nice setup, just enough to run AH2.
The only thing I would change {from experience} is your speaker choice.
The Creative Labs Gigaworks 5.1 S700 {$299} is not only cleaner through the entire mid-range, but has a tighter more precise sub for better and deeper low range.
I had the S700's for about 6 months before moving to the S750's 7.1 setup, both are outstanding.
I have owned the Klipsch Pro media series before getting the S700's and while it is a nice product, the Creatives are just a little better.
My 2 cents