I looked at the X-530s but had been fortunate here to have simply psotted the Z-640 set due to the way speakers have to be set up here. A pair of cheapies or a 2 1/2 setup won't do the job. The image here shows how those look for the older set.
Even with the 5.1 set and the fronts and rears close to each other you can still hear the separation as well as use the balance controls. The main thing is what will work the best there and your price range being considered. For 7.1 capability newegg currently only sees one Creative set instock at the moment.
http://www.newegg.com/Product/Produc...82E16836116153