said by ajwees41:good luck finding a tv that takes cable cards.
I agree with this... as now cablecards are generally limited to tuners not the TV's themselves... my approach would be WMC and either a SiliconDust HDHomeRun Prime, or a Ceton InfiniTV tuner and use 1 tuner (1 is referring to the box/card/device... they can have 3-6 tuners in them depending on make/model primes are currently 3 while ceton makes 4 and 6 tuner models), one computer and extenders at the TVs (for just TV/recordings ceton echos are usually good enough but xbox 360s are usually what I recommend), . Usually one has a capable computer that won't give too much trouble, but all network connections should be wired not wireless... MoCA can work at some locations that may be hard to get wired ethernet to.
As Bryan suggested, the samsung tuner (GX-SM530CF) may be easier to incorporate into the solution. The reason they "need" to block most of the analog portion (other than locals/starter) is economy does not include ESPN and other channels which would also normally be available as analog. If you already have a box (or cablecard) there is a "fair" chance they don't bother to send someone out to put the filter in place right away but eventually I believe you would get the filter on the line. Viewing any channels you are not entitled to would be considered cable theft.
All the solutions proposed would require one spending some money to save money and for many would be more than what they would save. I usually compare WMC/Tivo to DVR solutions not just watching as that is where the savings is. It would take 1-2 years of box rental savings to pay for the extender or tuner at the TV (about half that time if considering/replacing a dvr) not to mention the TV would also more than likely require hdmi inputs (and not to mention the Tivo fees if going that route). One of my most recent installs was for my parents who had 2 guest bedrooms that they were paying $100+ a year (each) for boxes that get used maybe 20 nights a year. The install worked well enough that after I left, they went ahead and replaced their main cable box as well and are now saving over $300/year (with only $100 out of their pocket since I gave them the tuner and 2 extenders for Christmas)... since they were also finally interested in a DVR, the solution cox gave would have cost them $450 more per year so in a sense this is saving them $750/year.
In your situation DirecTV or Dish may be a better option but only for a couple of years (then switch back to cox and take advantage of deals new customers can enjoy... but I believe to be considered new you may need to also switch to dsl) 90% of the time, there is no problem for most using DSL, I think most of the people who complain about DSL are the same that are using >250MB/month and are still complaining about their overage notices here and are not "real" people (sorry to all those here that are real) and/or people whose "homes" would be considered multi-family (or probably multi-individual would be more correct), where in theory each person should be getting their own roommate account.
Note: Thinking of this, to me, shows why the economy channels should not have copy once status as then other dlna capable equipment (including "smart" functions built into the TV) could use the capabilities of the prime without any more equipment (eventually DTCP-IP might be built into the TVs but that will probably take awhile).