Shill- not your fault...it's just plain confusing! I was just apologizing for making things worse.
The main question...do you really care about the third dish from a hole-in-the-roof point of view? If so, it might be worth it to buy a DISH 1000. If not, the second dish offers more flexability, and it is FREE.
I bought a DISH 1000 because I needed new LNBs and it was cheaper than buying them separately. I tried putting it up, but it couldn't get 110 from one mast, and couldn't get 119 at the other. I asked my wife if she cared if we had one dish or two...she didn't. (Of course, we already had 2.) Hence, the unusual setup described above. The 1000 is now in the shed until things shake out with HD-LIL- it's possible I might need to go to a 110/119/129/148 set up. In that case I will try mounting the 1000 somewhere else to avoid a 3 dish setup.
As far as getting "more channels", that depends. Iceberg says your extra locals are on 148 & 129. I would have assumed 61.5, but Iceberg usually knows, so I'm not going to look it up. 129 has Voom and 148 doesn't, so yes- there are "more" channels on 129, but you lose a few Public Service channels and the (in my opinion) fun free previews of foreign channels. If your locals were at 61.5, 129 would have less overall, because 61.5 has Voom AND Public Service AND foreign channels.
Again, the second dish offers more flexability. You can point it at 61.5, 129 OR 148. With the new Rainbow bird and other uncertainties about HD-LIL, you might need to change your setup in the near future. (That's why I didn't sell the DISH 1000 off.)