Surround Speakers

[eric04m]

I have been working on my home theater for a while now, I have an integra DTR-20.1 receiver and Paradigm Monitor series fronts and center. Just bought the center yesterday have not even got it set up yet. My Question is do the surrounds need to match when I was picking up my center the guy told me the matching surrounds were 400. If they do not need to match is there a good surround for cheaper.

Also one more question I am using an onkyo sub that came in my original HTIB would it be worth it to go with a different sub and does that need to match anything

Thanks in advance