Like Lenni posted, you won't get weighty bass without a floorstanding speaker. Sure, a really good monitor will sound convincing, but after a while you might be left wondering what you're missing, particularly if you like very dynamic classical pieces.
Given that, you might opt to buy a great pair of monitors and then save for a good sub. However, not knowing what your speaker terminals look like on the receiver, it's hard to know whether they would accommodate two sets of speaker wires (one to the monitors, the other to the sub).
I like to reference companies that design speakers with a generally flat frequency response and wide dispersion (in other words, the off-axis frequency response doesn't change much from the on-axis). There's been research that shows that these are qualities that people generally associate with good sounding speakers. PSB and Paradigm make speakers following this philosophy and seem to be the most noticed (among others such as Axiom Audio).
Personally, I've listened to the Paradigm Signature S2 v2 - not sure if the current v3 iteration is still priced at $2500 as that was about two years ago. I've also heard the biggest one in the Signature line - the S8 - with the same tweeter that the S2 v3 should have. Taken together the sound is very refined and exceptionally clear. The treble seems to extend forever without getting shrill. I think it would acquit itself very well with jazz or classical.
I've also listened to the PSB Synchrony One. If the bookshelf possesses the same qualities as the floorstander, then you can expect a clean top end but perhaps a bit more midrange bloom than the Paradigm.
Either will definitely highlight weaknesses in the rest of your system, so it may cause a case of upgrade-itis.
KEF might also be a good choice. The R300 was well-reviewed so the monitor in the line will probably share the same characteristics. I've also read good things about the Monitor Audio GX100.
That being said, I recommend starting with the Paradigm Signature / PSB Synchrony lines and branching out from there with your specific tastes.
Edited by yage - 1/15/13 at 6:54pm