I currently have an HK avr 525, running a polk audio rm6700 speaker set up, and a Yamaha swt150 sub, along with a mits 55" widescreen. I am looking to upgrade to 7.1 from my current 5.1. I can either look for two small sats for the side surrounds, or replace the two small sats(on stands)with two larger fronts, and move the current front sats to the sides. While the 6700's are not the greatest speakers, they are nice and small. Am I better off looking for two new sats for the sides, or replacing the fronts, and using them as side surrounds? I am on a tight budget, so even used speakers in good condition would be considered. Any help appreciated!