If you are looking for something cheaper than the above configuration, you could get a 722K and share the SD output among your secondary TVs.
America's Top 200 $59.99 (add $10 for AT 250)
DVR Service $6.00
This doesn't include the $20 off per month for the first year deal that is going on right now. Also, if you wanted additional HD boxes, it would be $7 for each one and you wouldn't be able to watch DVR programming from your main receiver through this box. HD DVRs are $10 for each one and you still wouldn't be able to watch DVR programming from your main receiver (and vice versa).
You can play around with the configs at http://dish.com/packages
. However, it doesn't include the pricing for the Hopper and Joeys yet.