Good speaker match for Krell/Naim?


Current system as follows:

Naim CDX/XPS cdp
Audio Research LS7 pre
Krell KSA 50S power
Old Tannoy speakers
Chord solid interconnect
QED speaker cable

Nice sound although a tad bright and needs to be more rhythmic - I am looking for a suitable speaker match.
Any suggestions?
dave_sax