Tufline makes quite a range of discs. Anywhere from the typical angle frame, extreme light duty ones like at TSC to big, beefy, serious professional models.
I'm in the market for a disk too. An aquaintance just bought a Tufline that is very impressive. It says on its label it is one of the 'TH' models but does not look like the 'TH' models on the Tufline web site. It has 22" disks and this sucker is heavy. I'm not sure about the specs, but the website says around 1000 pounds with 20" disks. His has 22's and looks a little beefier than the one on the web site. I think it is the 6' 8" model. It has tubular gang hanger, rather than flanges and it has pillow block bearings rather than 'flange bearings.' I am very impressed with it.
I hooked it up to my 45 hp CUT. The 3pt specs say it will handle a disk this size. It lifted it okay but there was not much clearance between the front disks and the ground even with the hitch all the way up. So transporting would be tough. There was a lower set of hitch pin holes so that might resolve that problem. However, even though it lifted it...it strained and even with the loader on, it got light in the front. So I need a little smaller, somewhat lighter set.
The nice thing about the Tuflines and in particular this TH series is that you can get 18, 20 or 22" disks (notched or round), you can get 7 1/2 or 9 inch disk spacing and you can get the tubular gang hangers and pillow block bearings even in the smaller TH series disks. I'm going to take a look at a 6'4" model with 20" disks and I think my tractor would be able to handle it better. The TH series axles are also 1 1/8" compared to 1" in most of the others.
Now here is another thought. Tufline makes this same disk in a hinged model. On the hinged models you can get 9" disk spacing up front and 7 1/2 on the rear gangs. They say the 9" spacing is better for cutting and tilling while the 7 1/5 spacing is better for seed bed prep. At first I didn't pay much attention to the hinged model but then I thought of a few things. I'd like someone to confirm that I am correct in my thinking:
1) The hinged sets are heavier, which can be better.
2) With the rear gang folded on top of the front gangs, this should be easier on the 3pt system since you would have less weight hanging way out behind the lift points.
3) For cutting and digging you could keep the rear gangs folded over the front gangs to put a lot of weight on the front gangs for better cutting and digging action.
4) With the disk unfolded, you get better seed bed prep with the 9" spaced fronts cutting and the 7 1/2 inch spaced rears following to 'harrow' the seed bed.
To me, this sounds ideal. Especially since everything I am planning on disking will have been previously plowed.
In any case, sunspot, take a look at the Tuflines. If you primarily need cutting and tilling, one of the heavier Tuflines would be ideal. I have no idea how much these Tuflines cost, but I suspect a heavy hinged model with pillow block bearings is going to cost waaaay more than a KK, Howse or Leinbach.
If I can't afford a Tufline, I'll likely get a Leinbach. They are probably not any better than the KK, Howse and lower end Tuflines, but they make them nearby and I can pick one up for cheap.