Big fan of new new BXTII. Not really thick like Don's CLD tiles nor SS's stuff, but still well made. I think the ultimate bang-for-the-buck would be to run BXTII all over, then run some heavy CLD tiles from Don or SS over the important parts that you want DEAD. Then of course foam and MLV as needed.
Nice. Post up some pics if you can. The rear cargo makes a great difference. I think the doors made the biggest difference for music sound quality for me. But killing the rear tire noise in the rear quarters really helps out just driving along. I would love to get into a "stock" Escape and drive around then then get back in mine. I am so used to it now, I forget how much improvement sound deadening offers.
I would deaden the roof last personally. Road noise comes in the doors, rear panels, through the floor and the firewall areas. Not a lot of noise comes through the roof compared to those places. Sound deadening does take a while and there are lots of good and bad products out there. I will confirm that Don's products on sounddeadershowdown.com work very well. Take the time to do it right and you will be happy.