Does anybody know if there will be any significant improvements in any of the new Panasonic, Pioneer, or Phillips 50" models for plasma and LCD technology? Would it be worth waiting another 4-5 months to purchase? Or will there not be any significant improvements? Is the Pioneer 50" plasma worth the extra $1000 or so compared to the Panasonic 50" plasma? Ideally I would like to spend no more than $3500 or so on a set, but would be willing to fork out the extra $1000 if it was really worth it. Any insights are greatly appreciated. Thanks.