Numen', if there's any way you can come up with $500 for two pair of the ELT dipoles at AV123, problem solved -- you'll have EIGHT 5" and EIGHT tweeters for $500. That's a lot of drivers to make a surround sound field.
If you can't afford to get four at once -- well, the RS300 surround which is almost identical and is not being discontinued lists for $399 @ pair, should the ELTs be sold out when it comes time to get the second pair...
Or two pair of the SVS will come in under $500 -- you get half as many drivers pointing in half as many directions, and direct radiators are tougher to make work in the rear unless you have a good amount of space behind your seating position.