Next step suggestions, from Spendor SP100r ?


Hi all,
holidays are very "dangerous" from an audiophile point of view, because there is time to think more about your system and subsequent changes ;-)
So, in these holidays I started to think a way to make some evolution in my system, starting from speakers but not only, even if I'm satisfied for the actual sound.
My question is how to evolve the sound of Spendors SP100r (not r2) without loosing their superb musicality. In particular I wish a deeper and controlled bass, more punch, without loosing efficiency and SP-100r mids.
Now my taste of music is 80% Rock and Electronica, 19,99% Jazz and practically no Classical music, even if sometimes I like a good sounding system for this genre.
Starting to think about that, I have difficulties in creating a list of speakers to hear ;-) who can me help with some suggestions? Consider this a brainstorming exercise :-)
My system pictures and composition are in my profile, my listening room is 11m x 4,5m but I have some restrictions: speakers distance from the rear walls not more than 70cm, from side walls not more tahn 30cm., speakers not large more than 55cm due to my furniture shape. Listening point is around the middle of the room. The floor has an acoustic treatment.
Thanks in advance for the suggestions :-)
-Massimo
.Vitus Audio RI-100 amplifier
.Weiss 202 DAC
.TW Acoustic Raven One+ SME310 + Dynavector XX2mk2
.Audia Flight Phono preamp
http://forum.audiogon.com/cgi-bin/fr.pl?vevol&1308315331&view
maz65
And about Harbeth M40.1 ? Could I make a step forward of it is more or less the same as SP100r ?
And as far as JBL goes, see if you can listen to the K2 9900s or what I have, the S4700s. The retail price on the S4700 has been reduced to $15000 USD.
Thanks Dave, I will give a try to S4000s.
About Spendor/Harbeth, I guess I also prefer Spendors, not only for the sound but the major efficiency that is good for listening at low volume.
Maz,

There is a European distributor for Skylan stands since they are popular for Harbeth as well as Spendors.

Another thing that occurred to me is your choice in speaker cable. The Kimber cables tend to have a deep and nicely controlled bass but can be somewhat thin and lacking in body above the deep bass. You may want to try some alternatives for a fuller, more robust sound. In my case, I use Wireworld Eclipse (the original version, not one of the later models) but I am sure there are others that would work well with the Spendors as well.