Coda CSIb - what loudspeaker would be perfect?

The perfect speaker is one that sounds the best to you in your price range. In other words; your quest is backwards. Since the speaker is by far the most colored of all components you must first find a speaker you like and then find an amp that is a good match for driving it.

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I agree with Herman.
Try different combinations and choose the one you like the most.

I agree with the others. By all accounts, Coda makes good gear, and that integrated should be very capable of driving most reasonable speakers, so pick one that you like and go with it.

"first find a speaker you like and then find an amp that is a good match for driving it."

How can you find a speaker you like if it is powered by amps at random or the wrong amp? If you like what you hear, maybe you have found your keeper amp too. Maybe one should find the right speaker and amp at the same time to avoid the endless cycle of dissapointment, unless, of course, that is what you enjoy. :)