Upgrade B&W speakers or MArantz Receiver?

I have to agree with steveaudio. You'll see an improvement going to the Rotel, but it won't be worth it. The speakers you have could sound GREAT with better amp and source. Of course, I am in love with the 805's. I'm afraid I have to say, hold off until you can afford a great amp. Later you can upgrade to a pre-amp with home theater pass through. This allows perfect two channel, but allows you to use the main speakers as part of the H.T. system. Use the marantz as a pre-amp until then. His recommendations are good ones. Throw in Aragon 8008, Belles hotrod in your pricerange. Add analysis plus oval 9 speaker cable- less the 200 used for 8 ft pair. Remember- You never see a Nautilus 805 in the store hooked up to a marantz cd player and receiver- start with the fundamentals and your current speakers will sound better. Good rigid stands are a help. Sorbathane or vibrapods under the cd is a great cheap tweak. Have fun.

Ps- Steveaudio and I are talking two channel amps. Use the marants for the surround. Thats why your 800 is buying a much more natural sounding front channel.