Hi I have two sets of polk ex357's and I am in the market for a new set of components. I noticed a few 3 ways but There are a lot more 2 ways. Is it worth getting a set of 3ways. I checked ebay and didnt see much. I saw a nice looking set of a/d/s for like 600 bucks or so. and then I am now looking at the diamond audio hex series. One more question, is it worth it to get a better set of speaks in the back or just stick with the polks and amplify only the set of comps in the front. Thanks for any help.