I just picked up a discontinued model (AVR-486) Denon Receiver with a DVD player and 6 speakers w/ subwoofer from Best Buy for $300. I am thinking about getting new speakers for the L/R front - possibly center too. The ones it came with don't sound bad - but I also got a $230 Best Buy gift card. Should I use the gift card and get some Klipsch bookshelf speakers, or sell the gift card to a friend and use the cash to get something else? The receiver puts out 75Wpc and I am looking to keep the speaker size to something small - possibly an HTD middy? Would there be a big sound difference between the small Denon speakers and a bookshelf-size Klipsch/HTD/AV123/SVS model for