After months of searching Craigslist and classifieds for a used 8' heavy disc with 22" blades on 9" spacing I have yet to find what I am looking for. It looks more like I am going to have to go with a new unit instead. I am likely going to put this off until next year, but have narrowed the field to the following:
1) Frontier DH1396, 63 lbs per blade, $3250
2) Howse DHT20022, 55 lbs per blade, $2200
3) Marion(Atlas 1500), 93 lbs per blade, $3100
All of these are 8' wide, 22" blades on 9" spacing. All have the "captured" attachment points for the lower lift arms. The Marion unit has a screw adjustment for the blade angle settings while the other two use a pin through the frame. Pin version would seem to be easier to use and not require tools to adjust. The Marion has scrapers included for the price shown and has greaseable bearings. I am unsure about the terminology used on the different bearing types. I have attached close up views of each bearing assembly and the Frontier file on page 4 shows all three versions offered by Frontier. I believe the DH1396 is the one shown in the bottom right picture. I recently read in another thread where some were praising one type versus another. I also noticed the Marion unit has an extra brace on the inside of the gang hanger. In talking with my local John Deere dealer, he recommended the Frontier DH1396 as far as size for my needs.
Thanks so far for all of the input received. Out of those listed above and based on information provided, I am curious to see which one would be most recommended. Obviously the cheaper one would be most desired financially, but I am looking at this as a long term purchase and don't want to cut the corner and live with regret.