jumping back in, where should i start?

Hi, I have owned cary, belles, joule, and audio physic tempo's. all has been sold and am back to my first system that gave me a taste of what hi fi can be. I am wanting to upgrade but just not sure where to start, or how much of a difference will i see by bi amping my speakers? Currently I have b&w 630 speakers with a rotel rb980 power amp with a 940 tuner/preamp with a 991 cd player, i am wanting a warmer sound with fuller sounding bass. mostly listen to blues, rock,thank you for any info.Scott