I recently purchased a set of Alpha 50s from Crutchfield along with the Alpha center and recieved a set of Primus surrounds for free with the deal. Here's my question. I've got an opportunity to purchase some Kappa 400s and I'm wondering, how big of a step up is this? Will they be a close match to my center? Also, if I stick with the Alphas I'm considering switching out the center and getting either the 37c or the Beta C360. The 37c is kinda hard to find but I can get the big C360 for around $300 on ebay. Will the beta voice match to the alphas? I know there are several questions here...your input is appreciated.