A litlle help for choice of speakers up to €5500 (used or new)

Hi folks. 

In advance I need to say that I am truly gratfull to be among you and learn with you all about this most passionate area of audio/hi fi. 

Wishing you all a Merry Christmas and a Happy New Year.

Now, what brings me here today is a request for your help in an area so important to me. The purchase of loudspeakers. Perhaps the most important element of a system. And at this point I feel a little lost before the many choices and options available (nationally and internationally, new or used).

Having this budget available, I would like your precious help in choosing speakers within those values above.

The ideal objective would be to reconcile two worlds to which I very much identify myself in audio ...

I love a good mid range but also feel intrinsically need to have good bass that make me feel like "completely filling the room" (correctly, of course) with a full bodied sound.

I'm not referring to the bass of "impress your friends", but deep bass, dark, correct on the timbre and tonally that permits you to connect fully with the music.

The listening room is of an average apartment, by European standards. It has 35m2 and with good acoustics.

Previously (giving a bit of my experience to better situate the intended objective) I had some portuguese handmade speakers, skillfully built with many units and sealed box, that gave me years of pleasure with very good high and low frequencies. But I needed a little more presence in the mid-range and so I decided to change radically... 

I ended up buying from a friend the Harbeth Super HL5 loudspeaker, which I knew well as a regular at his home. From all my audio experience were the loudspeakers that sounded better at this level of the midrange. I've never heard voices so naturally and realistically. But not only. The whole mid range is fabulous.  

But nevertheless, ... I missed the bass I had previously with its predecessors. They were tonally correct basses that made me thrill more about music (I'm lucky that the setup room does not accuse the bass very much. So I can choose speakers with a significant bass). Both things are quite important to me. 

Now, the goal would be to get and reconcile both things, of course. Among all the other normal features we all look for in very good loudspeakers.

An important detail is also the need to choose a model / brand / topology that allows me to have the freedom to play loud but also to play a low levels of sound. Not all speakers allow minimum quality at low / medium volumes.

As a result, I sold the current Harbeth Super HL5 and am a buyer of something I'm not sure what ... so many models, brands and topologies.

I can buy new or used and even internationally if necessary (in Portugal post-crisis, many of the good audio stores have fallen and some others do not give the necessary support).

As amplification, I have an integrated tube amplifier. It's a JJ828 from JJ Electronics. A Push Pull with 75wt channel-separated current transformers with 8 KT88 Genelec Gold Lion tubes.

I had previously a Lavardin IT that many hours (years) of pleasure gave me, but after knowing and testing this model of JJ, I was taken with its quality and conquered me to the point of having replaced Lavardin IT.

Not relevant I think, but as sources, I have a Primare CD31 CD player, a Portuguese hand-held turntable manufactured by artisan Rui Borges (Rui Borges UNO MKII) and a M2Tech Young DAC for hi res files.

The phono units are more than one, depending on the type of music I want to hear.

Sorry for the long text, just wanted to leave you everything you need for a better help.

Once more and in advance, thankyou for all.

Miguel