I need a set of bookshelf/standmount speakers for a second system for use in a small room about 10' x 13'. I will be using a nice Simaudio moon I7 integrated and Cambridge Audio azur 740c for the digital side. The Klipsch are okay, but it is a little mismatched sound quality wise. Appropriate new speakers might run $1,000 - 2,000, so I wouldn't mind spending a bit on a replacement tweeter/woofer for the Klipsch and utilize the existing cabinet. Would it be worthwhile to "drop in" upgraded replacements or is this a bad idea. Here is link to the RB-51 II specs. Thanks
http://images.klipsch.com/RB51IICutSheet_635042121478370000.pdf
http://images.klipsch.com/RB51IICutSheet_635042121478370000.pdf