Harbeth M30 -

I currently own a pair of M30's driven by a McCormack DNA-125/MAP-1 combo, source being a UDP-1 Deluxe. The latter components were recent purchase (dare I say it, recent upgradess). It is a very nice musical combination, with great mid-bass and wonderful vocals (I listen to jazz, opera/classical and rock). Also, there is decent low end punch that is well defined

The Question:
Those who currently own Harbeths (esp. the M30) or have recently owned and upgraded, what is the next logical upgrade path? What was your next speaker choice and the underlying reasons for that decision.

My Choices
I am considering another (better?) monitor with fuller bass extension or, a full range of modest size as my room dimensions are not large. Price range, up to 4k used. Speakers I am considering,:
- older pair of Dynuadio Confidence 3,
- Totem Manis' II,
- Opera or Sonus faber (Cremona Auditor),
- Gallo 3.0 or 3.1's or,
- Verity Audio Tamino.
- Spendor SP100 or 9e

This above list is by no means exhaustive, just some of my initial thoughts.

Any further feedback or thoughts would be highly welcome.
Thank you in advance!