full range speaker suggestions

Budget? Speakers researched:

Audio Note AN-E/SPe HE
Cremona M
Helicon 400II
Marten Miles III
Avalon Indra
Horning Aristoteles Ultimate

DeVore Fidelity Gibbon 9's are tough to beat at their price point. Very dynamic and musical, and by no means bright or analytical.

Tannoy, the Prestige line, is a fantastic match with Manley gear. Check out AnneEve's system.

Please define full range. 20Hz > 20KHz? Good luck.

Flat across those numbers is a not so simple move, and then there's the room too. Finding 30 - 35hz is much easier and the choices are far far greater in those products which will then suffice or perform.

...and how much is in the till for the upgrade?

I'd think more about a sub than changing out for fuller range speakers.

True full ranger's on 100wpc tube amps that can provide substantial bass impact and depth as a sub would give is not quite so easy a task IMO.

if in a moderate to small sized room, Sonata IIIs might work for you. Dynaudio Esotar tweeter and bass ddrivers that begin rolling off around 30Hz in a 21 enclosed room.

Several folks in the know have at one point told me to look into the Total Eclipse or Super III with the soft domed tweeter.

your room size is gonna play a big part in this...