If you want to stick to the ten figure go with the 7's. The eight's might be a little better but your going to pay $3 to 4g's more for them.
And yes some dealers get refurbished 7's and 8's for sale. You can even get a warranty and set up. Personaly I think the set up thing is over rated. You can do it yourself. And beside most rooms will dictate within a few feet where you will want to put them. I had the 6's and then bought the 7's from a dealer. they came and set them up and they were put exactly where I had the 6's. I did a little clap test and moved them around for a few hours and accomplished everything the dealer did without the expense.
And yes some dealers get refurbished 7's and 8's for sale. You can even get a warranty and set up. Personaly I think the set up thing is over rated. You can do it yourself. And beside most rooms will dictate within a few feet where you will want to put them. I had the 6's and then bought the 7's from a dealer. they came and set them up and they were put exactly where I had the 6's. I did a little clap test and moved them around for a few hours and accomplished everything the dealer did without the expense.