As a new customer, the max equipment you can get at no upfront cost is a 722 (HD-DVR, 2 tuners, 1 HD output and 1 SD output) and a 222 (HD receiver, 2 tuners, 1 HD output and 1 SD output). You can pay to upgrade the 222 to a second 722. These would be leased.
Dish limits leased receivers to 4 TV outputs. To go beyond that with dedicated tuners for each TV, you'd need to purchase the needed additional receivers at retail, plus any multiswitches, dishes, and installation costs for getting them installed.
With the SD equipment, you can use simple cable splitters to split the output to multiple TVs, so if you can live with shared tuners on some of the TVs, then your costs will go down.