Hey guys: Thanks for your suggestions.* Just based on the reviews I have read (mostly on northern tool, amazon, tractor supply, and at sears.com), it looks like Michigan Seat (Milsco) gets the highest ratings for comfort and durability of the moderate or low priced seats.
I think I will order this low back Michigan Seat:
If it looks like the 1993 garden tractor (Craftsman GT6000 20HP Twin Kohler) can handle a higher back seat, I will probably go with the Michigan high back seat in the first post in this thread and put the low back seat on the 1994 riding mower (Craftsman II 19HP Twin B&S).
The only implement I would like to lean back and manipulate is the Gannon Earthcavator 42" which I am currently rebuilding and repainting, but maybe chieffan is correct, it may only be able to be properly manipulated from the ground.
I will report back with what I find when I get the low back Milsco seat.
* Bolens 1000: Don't full size tractors have all that already? BTW, I am also looking for a good set of wireless headphones if you guys have suggestions.