>> PianoTeq: try it, you will probably like it. full JACK support.
>> awesome application.
>>
>
> At 249 Euro, it should be.
>
>

Indeed, and it is worth every ducat. I reviewed Pianoteq for the Linux
Journal:

   http://www.linuxjournal.com/content/pianoteq3-linux-product-review

Paul's right, the app worked flawlessly out of the box, JACK support is
excellent, and the sound is fantastic.