I'm trying to put together something for real sound at home. I've been dreaming of this for 20 years. Anyhow, I need some advice on a proper receiver to use for this setup. I'm looking at getting two rp-280f towers/ rp-450c center or rpl-500c( which is better?)/ R-112sw sub/ and 2 rp-500sa atmos. Is this a good combination and what minimum requirements am I looking for in a receiver?