Tivo will work with Dish boxes, but it can be somewhat combersome. That being said I'm not sure how or if the Tivo Series 3 will work with a HD Dish box. I assume if you are considering the 622 you want HD right? I wouldn't even consider the Series 3 because of the huge cost, but that is just me.
If you aren't looking for HD then the 622 is not what you want. You want a 625. When you say two switches do you mean two lines? If that is what you mean, as long as you have DPP equipment then you just need 1 line and a DPP separator.
DPP is Dish Pro Plus. If you have either a Dish 500 with a DPP Twin (it will say Dish Pro Plus) or if you have a DPP44 (a switch) and Dish Pro LNBFs then you can split 1 line to run two tuners in 1 box. If you do not then what you will need depends on what else you are running. So give us a list of what equipment you are using and we'll help.
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