Personally, my target price for that would be $600. My target for $800 would be the 46". A couple of months ago or so, Amazon had the 42s1 + Pana bluray for $800. And since the bdp prices have arguably plummeted since then, I'd hope for something even better in the future. JMO. If pennies must be pinched, I think it's worth waiting.
edit: it's 768p, but that probably won't matter for SBF1 in the BR... if you know anyone who is a member at Costco, they have the TC-42PX14 42” for $549 thru December 13.