I want profoundly better bass

Looks like I caught your attention. I have a moderate sized stereo room that is about 12.5 feet wide and has no rear wall for almost 32 feet. With a large opening for the stairs on on side of the front of the room I have a fairly large area in which to propogate bass. My current speakers are either a pair of Apogee Mini Grands or a pair of Meadowlark Audio Hot Rod Herons. I have VTL MB-450s, A forte 4 and Vtl Tiny Triodes (with Infinicaps) with which to play amplifier roulette. Preamp is a hot Rodded VTL TL. 2.5 and Digital Source is an Ayre Cx7e. Vinyl is via a Dynavector 20Xh strapped to a Rega P-25 that feeds A Plinius Jarrah.
Here is the $64.00 question. Given the 2 speaks I have now and their proclivity to warmth and subtle detail, what would somebody suggest I do for speakers with PROFOUNDLY better bass? Budget is somewhere in the 5K range used preferred. If your thoughts are to subs, no thanks as I have been down that road. Even the Minigrand's subs are a bit too much slop and giggle compared to the panel parts of the Apogees. Here is another hint. BIG sound is good as long as images are not too stretched. Re. I do not want a 10 foot tall Diana Krall in my living room. I already married a gal who looks like her (only better) and would be very afraid of a ten foot tall woman. Thanks in advance

Meadowman