The 1000 is a western arc dish. It can see sat locations at 110, 119 & 129. There are several combinations of LNB's that could be used. Will work with any receiver that dish has with the right LNB's
The 1000.4 is an eastern arc dish. It can see sat locations at 61.5,72.7 & 77. It has an LNB/switch all built into one unit. Mainly used for new customers with VIP mepg4 eauipment.
What receiver are you going to use? What system do you have now?