Question for you B&W guys

Let me start off by listing my equipment. The amp is Krell FPB 400CX, Krell KCT pre-amp, Bryston BCD-1, Rel R-328 Sub with B&W 804s Speakers. Cables are Krell Cast, speakers cables are transperant. Here is my question...my system sounds extremely good with the 804's. I am thinking of upgrading to the 803D's. Would it be worth the extra money. I like the fact that the 803's have 3 base drivers. I must say the 804's with the rel sub give me plenty of base.

Thanks in advance