I did a tremendous amount of research about a year ago on the big box offsets. If that's where you want to go, at $500 the best I found was the Old Country Wrangler at Academy. It was the thickest one available for the money. The Pecos is just a very small amount larger, but not as thick. I would give up the minute amount of space for the extra metal. It will run right out of the box, but maybe some gasket material and a River Country therm would be nice. The only real mod that I can see is a Horizon style convection plate. But, wait and see how the temps even out before spending that money.
That's my $0.02 worth. Good luck, Joe.