Best used bookshelf speakers under $200 for clear vocals?

I've been hunting for a pair of used bookshelf speakers and could use some recommendations.

My budget is under $200 for the pair (used market), and my biggest priority is clear, natural vocals. I listen to a lot of vocal-heavy music like Celine Dion, so I'd rather have great midrange and vocal clarity than huge bass.

So far I've mainly been looking at older Bowers & Wilkins models like the DM601/602 series and the CM1 (if I happen to find a really good deal).

Are there other used bookshelf speakers I should keep an eye out for in this price range? I'm open to any brand—KEF, Paradigm, PSB, Monitor Audio, Wharfedale, Mission, etc.

For context:

• Budget: <$200 used
• Room: small (about 100 sq ft)
• Listening distance: around 5–6 ft
• Priority: vocals > imaging > bass

What would you buy in this price range if vocals were the main goal?