is it a wise choice to let go of my pv70 for this pv8?
If the amount you can sell the PV70 for is right and the balance you have to pay for the PV8 is negligible, why not. But can you get a deal like that?
Also, isn't the PV8 the current equivalent of the PV7 and not the PV70?
I follow the PV threads with great interest as I purchased a 50PV70 in March, but on the upgrade itch, I decided at purchase that my next upgrade would be in size and resolution and that I would skip the next few generations, since the specs of the PV70 are adequate for my current DVD set up.
Assuming that I wouldn't even have to consider the financial implications of the upgrade, I still would wait out a few more iterations of the PV before I even consider it, since there will always be an annual improvement that would be tempting to get. So waiting out for the next one will not get you in a vicious upgrade cycle, wherein every time a new improvement comes in, you have to get it. A more reasonable time to upgrade will come along, but that's just me.