Thanks to Christmas and a big paycheck I've been looking at some upgrades to my HT system. After Christmas I'll be using a pair of B&W DM303s and a LCR3 up front and a pair of Polk R20s for surrounds (I know - a strictly low-end budget system). My receiver right now is a Technics SA-DX950 which I've been relatively happy with. I'm also using an incredibly crappy Aiwa TS-W150 subwoofer. After Christmas I should have around $500 to play with strictly for HT upgrades. I'm already in the market for a new receiver purely because I want s-video switching and more optical inputs, but I'm also wondering how much of an overall improvement I would see if I went to a ~$500 receiver such as the Denon AVR1802 or Onkyo DX-TS595? Is it worth it for me to think about picking up a new receiver now or would I be better served by either getting a new subwoofer or saving to get new mains for an all-B&W setup? Thanks in advance for any advice.