It seems like you're about to purchase a pair of Mezzos.
They are nice speakers indeed. I think they sound best from 3-4m away (not possible in their demo room).
The higher model JMlab speaks are really nice. Very natural sounding. Tawag namin dito Kryptonite... maski anong ganda ng system mo, tatablan ka pa rin.
Di ko lang alam if they will meld well with the Cambridge Audio sound, baka sumobrang bright na (both brands tend to have a signature brightness).
I was looking at this speak before I went with the B&W. I didn't get to hear it with Cambridge gear, but it wasn't my cup of tea when it was hooked up with Rotel electronics (it still sounded good, but it lacked that special touch). It sounded great with Rega and Arcam amplification.
Ganito ang Grande Utopia EM:
Pag nakaganyan ka for sure hindi mo kakabitan ng amps na mumurahin.