How certain are you on the broadcasting of 1080p? I know come Feb 2009, analog will no longer be broadcasted and digital comes in full effect. I don't know if companies want to start broadcasting in 1080p in 2 years, because the majority of the customers will probably still have 1080i. That's the thing, most customers have 1080i and for stations to start broadcasting in 1080p it could have an adverse effect. And 1080i HDTV's are still selling strong.
And like you said, 1080p is good for TV's well over 40inches, companies have to consider how many of their customers will be ready for 1080p and how many of them will have well over 40" in their HDTV.
The sharp aquos is only 42" but it is 1080p, that's not much bigger than 40" and it'll be hard to see the "Full/True" HD. If I do go 1080p, it'll be 46" or higher, 46" if I get a really good deal otherwise it'll be 50" or higher.
Shit, now I'm really really really considering the Bravia 46". And by the time I need a 1080P TV, the price will drop heavily and I shouldn't have a hard time coppin by that time. The 46" Bravia will be a bedroom TV by then haha. Y'all opened up my eyes, good looking out.