I think all of the new mrv setups are swm types, meaning you only use one cable to each dvr. I would run two to each location anyway, just in case. You might want to run a third for ota use.
+1 At the BARE minimum, run at least 3 coax runs (I do 4 myself these days) in all of your "main" viewing rooms &/or where you might be actually putting a receiver. (living rm, master bed, media rm, etc.) If you want to to "backfeed" of these receivers to secondary TV's where you don't want to spring for a receiver, (kitchen, guest rm, etc.) you can put a modulator at each of your receiver locations, then backfeed them all on that 3rd coax, into where all your coax drops run & terminate to. You can then combine & split it back TO those locations. Of course, it will ONLY be in SD, but if you only have SD sets, then it's not a big deal. It's much easier & more reliable to use separate coax runs instead of messing with diplexing.
Also, DON'T forget to also run at least 2 CAT5/6 cable to these locs as well - one for a landline & one for home networking. (do it even if you DON'T have a landline now - you or a future homeowner MIGHT later...)
Extending HD from receivers out to other locations is kind of tricky &/or costly now - frankly the most cost-effective way IS using DirecTV's MRV service. But if you don't want to do this, you should probably consider running another pair of CAT6 cables, as there are devices out there now that you can switch, split & extend HD signals out on CAT6 cabling - Google it & you'll find plenty of info on how that works.
Another thing you can do that I've done several times, is run either bulk or pre-made component cabling (it actually contains 5 separate wires for the 3 component video & the L/R audio signals) from a sat receiver loc to a secondary loc. (eg: from a bedroom to a bathroom TV) But it is kind of bulky to work with & it's not that cheap; you also need special tools to terminate connectors on the bulk cabling. But if you only need it to extend HD for a couple of locs, it might work for you - here is an example of it:
http://www.av-cables.net/Bulk-cable/component-cable.html
The nice thing about running comp cable, is that on all D* HD receivers, the HDMI AND Comp outputs ARE active all the time, (except for 1080p stuff) so you don't have to mess with needing an HDMI splitter to run more than 1 HD set off the same box.
As far as the secondary locs, I'd still do at least 2 coax & 2 CAT5/6 to those locs as well. Again, the extra cabling cost NOW is minimal & it takes the same amount of labor to pull 4 cables as it does 1. You WILL appreciate having those extra runs AFTER you start setting things up in your new house, & later on down the road as technology & your needs change.
One thing about doing this is, if you do start utilizing all these capabilities in your new house, it does spoil you! I am doing a pre-wire right now for a friend that is building an addition on their house for his mother in-law to live in with them. Of course right now, they are all set up with 3 D* receivers, ALL backfed throughout the house now. In the new upstairs living rm, the wife thinks they should do a TV loc on ALL 4 sides of the room - which for their setup now WILL mean at least 3 coax's & 1 phone jack at EACH loc. When I told her she's adding quite a bit of extra work (ie: costs & labor) to this project, she summarily says "well, it's all YOUR fault"! When I said "huh", she said "well it's because of ALL the things you've done to allow us to watch WHAT we want, WHERE we want in the house, YOU'VE spoiled us all now & we can't possibly NOT have it all now"! (she was joking, in a way anyway...
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Anyway, sorry for the long message; might be more than you wanted to know, but with all the new technology HD, etc., everything is just changing so rapidly - go luck on your house.