I strongly suggest waiting for the already announce Vizios, some of which have wireless, actual rear surrounds for real 5.1. They are apparently great sounding soundbars at an affordable pricepoint, well below your budget.
The somewhat pricier (though still in your budget) top of the line Philips Fidelio...also with wireless rears, looks promising as well.
If you're interested in Surround, I don't believe any soundbar can achieve with emulation or beaming what a soundbar with real rear speakers provides.