For Western Arc, the only difference is the size of the dish and the spacing of the LNBs. (The 1k.4 is larger.)
For Western Arc, nothing overly noticeable other than the shape, size and adjustability of the dish. It's still hitting the same 3 sats. For Eastern Arc, it's adds the 77 Sat to the 61 and 72, which are the only that a .2 Eastern Arcs sees. the 77 is basically, in most cases, not really used anymore.
You would need at least one DPP44 switch. Is the ViP222k staying hooked up, in addition to the 4 ViP211's? If so, you would need to trunk the DPP44 to a second DPP44. That would give you enough outputs to connect up to eight receivers.
Adding the DPP44 switch disables the switch that is built into the LNB. You are going to need three cables from the LNB to the inputs on the DPP44 switch. The switch can be mounted outdoors with the dish, but then you would need four cables going into the building (one for each receiver) so it would probably be easier to put the switch indoors. The triplexer would not be used with this setup at all, since all of the receivers would be Solo receivers with only one satellite tuner.
Three, four, not that much difference. If you have to bring three cables to the switch it may well be easiest for it to be external because the cabling from there could be going four different directions and that might not be as easy from an internal location. Each installation has to be considered as to the easiest, and cleanest, method.
I thought of that, but I didn't know whether he wanted the exterior walls of the building wrapped in cables going to each room (some people don't like that, for aesthetic reasons) which is why I mentioned both options.
