Rookey, I just purchased a 2013 Rockwood 8289WS w/ Diamond Package. I did look at both the Flagstaff and the Wildcat prior to purchase. The Flagstaff and the Rockwood were essentially identical, and little things ruled out the Wildcat (like smaller 74" master bed) If you have narrowed down to Flagstaff and Rockwood, I would obtain a sales offer on both and then evaluate. Also consider which dealer is closer to where you live, closer is better. The frameless windows are a nice addition with the Diamond Pkg as well as the Corian countertops, but the Diamond Pkg will cost you another 3K to 3.5K. Also, the colored fiberglass exterior is not a "painted" exterior, but supposed to help hide the white streaking. Interiors fabrics were different between the Flagstaff and the Rockwood also, not a biggie, but we liked the darker leather and window coverings.
2005 GMC 2500HD, Duramax/Allison
Reese R16/16K w/ Reese Revolution
2013 Rockwood 8289WS w/ Diamond Package