I would assume you already have the fronts so the best bet would be to get the same as your fronts, smaller if necessary..the goal is to have all your speakers voice-matched. But if you are looking for some good "cheap" speakers I personally went with HomeTheaterDirect speakers and I love em. I have the level III 5.1 set and I am very pleased with the performance of them. Just a set of the mains which also work as rears go for about $220 a pair..not sure if thats what you consider cheap or not.
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