Calorgas, I would certainly be keeping the Greenwich if I could afford to. I can well imagine I'll miss them in the future if my circumstances change.
They go really quite low for their size, and there is a coherence to the presentation that the MG can't manage - though admittedly that might not be the case if I was in a larger room and could get more distance from the speakers. They also have a beautiful bell-like clarity and a more pronounced midrange than the MGs.
On the downside the tweeter is a bit hotter than the MGs, though this is workable with the energy control. And though they can hit the lowest notes that crop up if I'm listening to Basic Channel (dub techno if you're not acquainted) or similar, they don't do it with the effortlessness of the bigger cousins.
The Greenwich really can put a credible image of the performance space in my room, and they do it as well as the best BBC monitors I've owned but with an aded dynamism and agility I've never heard from those. But the Chatsworths seem to put me in the performance space, if that makes sense. Or to put it another way, they are able to portray a double-bass or a piano, for example, on a human scale, more so than any other speaker I've had. The obvious downside is that I am having to work to tame the bass, but as I only use digital replay this is pretty easy to do with EQ if necessary.
The Greenwich have a more modern sound and think if I was to keep them I'd be too tempted to look for a valve power amp to go with them, and this is an area I really want to avoid, mostly for financial and convenience reasons. The MGs, being that bit warmer, are working brilliantly with my First Watt M2, which I'd very much like to keep - it sounds very very good and being a clone was pretty darn cheap.
I could certainly live with either, but for now, as I have a suitable space for a larger speaker for the first time in ages, I want to see how good I can get the Monitor Golds to sound. Their ability to give me complicated, dynamic, even noisy music in an uncongested, involving way, and yet be intimate when required, is totally addictive and it's exciting to think how much they may be being held back by the cabinets and the crossover.
I've declared a number of speakers to be my last, but honestly it's hard to imagine changing from Tannoys now I've found speakers that can do natural tone/timbre as well as pace and dynamics. More than any other speaker I've had they are able to cope with a truly complete range of music, and that for me is the holy grail, and the source of a huge amount of box-swapping these past five or six years.
.