So we've been working like dogs to finally finish our basement (that's a whole nother thread

) and I've been given the green light to get a 70" tv for the entertainment area.
My question is on the Sharp 70"; I've never been a fan of Sharp but they seem to have the market in the 70-80-90" range. I looked at the standard 70" 120 MHz, and I don't really need 3D, I just want a good TV with WiFi and don't care about the bells and whistles, so is the cost to move to the 240MHz worth it?
I want to make sure there is no motion blur as I like sports and fast movies, so is getting double the refresh rate "better".
Let me know if you have the 120 MHz 70 or 80 and what they are like for motion blur.
Thanks,
Bob