pretty sure you should be able to add the digital tuner of the 650 fairly easily, if you cant through regular setup then you can try http://mce.ramonvanbruggen.nl/...com_frontpage&Itemid=1 which is generlay designed to add a 3rd (or ...) tuner not a second but might work. I only have an analog tuner (theater 550) on my vista box right now so I cant say from experience but I don't see why it wouldn't work.
As to the Dish local channels at the very least you can go to guide setup and add/edit channels to either check the channels off or in a worst case scenario manually add them.
As to the Dish local channels at the very least you can go to guide setup and add/edit channels to either check the channels off or in a worst case scenario manually add them.