Since you would be "new", you might get the fastest/newest hd dvr and a bunch of freebies. I've been with 'em for 17+ years, have a dvr that's 5 years old and takes forever to do the simplest tasks. Just search this forum for "slowness" and "slow receiver" and you can read for hours. I was thinking of dumping DTV for TW cable!! DTV has been most unhelpful with the situation.
If you're out of contract, just cancel DirecTV. Within a week or so, you'll get a "We want you back" letter with a great rate and probably new and better equipment as well. It's funny how DirecTV won't give you newer/faster equipment to keep you as a customer, but they'll bend over backwards to get you to come back. Makes no sense to me.