Attention to detail

Spendor S3/5 for $600 used...or better the Spendor S3/1p for $8-900 used: +4dB more efficient, with much deeper bass.
I just built an entry-level system for a good friend from these Spendors and a used Complete Integrated, fed by the new NAD 541i CDP through Nordost Blue Heaven to start.
Should turn out exceptionally well, I trust. The lushness of the ARC and the exceptional coherence of the Spendors should seduce.

My B&W dealer thinks the 603S3 is godawful! Pretty lumpy bass to me, too. The bargain here is the ungainly-shaped 602S3, by far. For $800 used I bought FAR more natural Spendor SP3/1p, though the B&W will play much louder, deeper, and brighter. Depends what you want. Just stay away from the universally-despised (I just toured Scotland, and ALL the B&W dealers raved about the 601 and 602, and hated the 603...no kidding!).
Maybe it works in your room, though, if the bass integrates in a weird way. Good luck.