Panasonic announced three new HTiB's at CES 2008, the SC-PT660 ($299), 760 ($399), and 960 ($499). The 760 and the 960 come with wireless rear speakers. The only thing is that they are not out yet, and there are no reviews yet on them either.
Another possibility is to get any HTIB and then add the Rocketfish wireless adapter from Bestbuy. It's normally $100 but I've seen it on sale. I've heard relatively good things about this unit, but I have not heard it yet.
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