general guidelines
I wouldn't
recommend the 70e nor the 60e.
Not to say you couldn't get some stronger signals on 'em.
All the ones listed under DishNet & DirecTV would be my last choice to play with.
The D-500 and the Phase III are just too small, regardless of some members here (even me) experimenting with them for fun.
I wouldn't spend a lot of time with the SuperDish or Slimline, 'cause there are no feedhorns that will make maximum use of their area.
Yes, here on the forum, some members have put regular after-market LNBFs on both and bragged about their success, but as I see it, there's a fine line between
good and
getting by.
In the end, bigger is better, clear days are better than rainy ones, and a bird in the hand....
These answers are seat-of-the-pants, and personal opinion.
Best if you experiment, if you don't want to take the good advice and go with 36" dishes.
Transponder power and satellite footprint vary from one to the next, and across north America.
Some S2 signals with poor FEC will require the top-of-the-line for reliable reception, so keep that in mind as well.