masyado kayang maingay ang 18"?
Again, it's all about yung velocity and dynamics ng pagpalo mo. If you listen to Hiromi Uehara's live rendition ng "Another Mind", you'll notice yung drummer hitting the china cymbal (and the rest of his gear) in a way na subdued na parang bumubulong kung kailangan, and full attack pag pa-crescendo parts. Great cymbal-work.
Size really won't matter since nasa musical application yan.
And tama is cholok3, have someone hit yung cymbals sa lahat ng areas nya and lumayo ka para marinig mo from a listener's vantage point.
Gud luck sa pagbili. Post pics ha