What the best 89-90 db speaker I can buy for 3k?

"07-29-13: Schubert
In Classical music, which is 90% of what I listen to, dynamics are many times greater than in other music, the lack of same makes things somewhat "dead" no matter if the tone, imaging, scale etc is spot on."

I agree, but every piece in your system contributes to this. It makes much more sense to look at what the whole system will be than just the speakers. If you mess up with one of the other components, you can loose the dynamics that you are looking for even if the speakers are capable.

Rest of system is quite dynamic.

Vienna Mozart and Beethoven series

AudioKinesis, most of their speakers are 93db effciency. But only the Rhythm Prism is in your price range. I have no experience with this brand, but the guy that sold me his pr of Thiel CS2.4 a while ago told me that he was upgrading to a pr of AudioKinesis due to their high effciency and the CS2.4s lack the dynamic contrast he was looking for, so it looks like you are looking for the same thing. Worth a look, but don't blame me if they don't sound to you.

I'd suggest looking into a used or yet unsold pair of Gemme Audio Tantos in either V1 or V2. Both should come in at or below your $3k budget.

Sensitivity rating is 91.5dB/W/m, and they are very easy to drive. I think they sound fantastic and should fill your 17 x 13' room with ease.

Here's a review that details their sound with different amp types. http://dagogo.com/gemme-audio-tanto-floorstanding-speaker-review