I'm waiting for the "Repoint Kit" to come out to convert my SuperDish 121 to whatever they are going to call it (for 110/118.7/119/129).
Unless you need 118.7, I think the 2 dish option may be the easiest way to go and peak each dish. If you don't need 121, then it shouldn't matter which dish you use for what.
...SD 121 could be re-alligned to pick up 129 using the 119 or the 110 LNBF; or
...Dish 1000 could be re-alligned to pick up 129 for the best signal, maybe even using the 119 LNBF.
...Use the other dish to peak 110/119.
However, why make it easy. Here's a couple of choices.
(1) A little after Team Summit ended, I believe Scott posted a thread from another site, or something, which showed how someone obtained the LNBF assembly for the 500+/1000+, possibly by buying the whole dish. He then modified the arm, or some other bracket by drilling holes in different locations which changes the focal of the LNBF cluster, when attaching it to the SuperDish 121. This provided him with the 110/118.7/119/129 orbital locations, and using the largest of the Dish dishes.
(2) Or you can go even easier than than. Well before Team Summit, I knew there was going to be a 4 orbital location dish coming out, but did not know which birds. While waiting to find out what new toys would be available, I bought a DP Dual LNBF and I-Bracket and duct taped it to the side of my SuperDish 121. Just before taping, I held it against the side of the shroud (121 side) and moved it to find the best signal. I then taped it.
---I could use spaces for a slightly better signal, but not worth the time.
---The duct tape may need tightening every 6 weeks.
If the Repoint Kit is not available soon, I will either buy a Dish 500+ and use my extra DP Dual LNBF to make it a 1000+, or cut me a couple of pieces of rectangle pipe (arm from a Dish or DirecTV) and make a permanent bracket.
Here's the picture.
EDIT:
Yesterday I called Dish Store, and I believe he only had 1 Dish 500+/1000+ left. Although Dish Store doesn't make you buy the mounting foot, swtich. etc..., you are able to buy just the dish and LNBF assembly. The majority of that price is for the LNBF assembly, so you are not wasting that much money. However, I'm sure he would sell you both the dish and LNBF assembly and not ship the dish if you did not want it. I did not ask, but shipping the LNBF assembly may be cheaper than shipping it with the dish, and maybe you could save some expense there.
EDIT:
I don't know what adjustments would be needed to remove the cluster from the SuperDish 121, and replace it with a "single DP Dual LNBF" or even the "Dish 1000 LNBF Cluster". Let us know if you try it.