There are lots of great options here. I just looked up the B&W 803D and it says nominal impedance of 8 ohms, min 3 ohms, and 90 db efficiency. Conventionally I've seen B&W's as better driven by solid-state (rather than tube) amps, so I will limit my options to solid-state, although a bigger tube amp might be just fine, too.
Just to name one, an amp that I feel is great for the price that could drive the B&W's well would be the Marsh A400. You should be able to find one used for around $1000.
Michael
Just to name one, an amp that I feel is great for the price that could drive the B&W's well would be the Marsh A400. You should be able to find one used for around $1000.
Michael