I love my 2011 25000 Burb. I looked for a long time for a 03-06 8.1L. I was very selective/picky, but could not find many I'd be willing to purchase over the course of about a year. If you can stay under the hitch limit of 1000 pounds (you are close), then a 2008+ is great. 6.0L + 6-spd rocks. Decent compromise of power/performance and fuel economy. You might want to invest in a Sherline scale if you are leaning towards a 2007+ one. My payload per tire and loading sticker is 2051 pounds, heavily optioned 4WD LT.
If this will be a dedicated TV, I'd look harder for an 03-06 8.1L. It is a superior towing vehicle than mine.
Similar powertrains/capability in 3/4 and 1-ton vans will cost far less to purchase.