Wilson Duettes sound great and look great too.
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Try Genelec 8040, 8050 or Focal Twin 6 Be - all are designed to sit on a studio meter bridge and should sound great on a book shelf.
I have the Genelec 8020b as office desktop speakers and they are without parallel for their size (if you like precise sound) - for a bookshelf you will need a bigger model Genelec.
In my experience, Silverline Minuets are worth a look. They're rear-ported but are largely indifferent to placement and can benefit from rear-wall reinforcement. A couple of others monitors that are frequently recommended for use in a bookshelf are Rega R1 or RS1 and Von Schweikert VR-1. I haven't heard either, but many people swear by them for this application. Some sealed or front-ported models are tricky because they're designed to be used in free space. The question comes up pretty often; a search on the topic would give you additional ideas.