If you have not had Dish this is the time to get a 722(k) for a low price, installation, and good programming for a reasonable price. Go DVR. Go HD. Go HDD. With contract if you need to get out, lower programming to min allowed for remainder of contract and just pay it off--better than buying.
Don't saddle yourself with old equipment and new install will be less than re-install of used. See Claude at Dish Store. From everything I've read--he can steer you to match what you need.
If you've been with Dish, then you may have to work it out.
-Ken