chaz:
I'll second bostonmtnman's choice on doing Sections 2 & 3 of the OHT. He and I actually did those sections last January and had an awesome time. There were some blowdowns affecting the first part of Section 2 earlier this fall, but they may have been cleaned up by now.
As far as the BRT goes, it's a great trail. I did an end-to-end hike of it back in October and had a really great time. If you want to read my trip report, you can go to the link below:

http://www.arkansasbackcountry.com/buffalo-river-trail-f27/boxley-pruitt-trip-report-t433.htm

Have fun,
Oz