(something wrong, I wrote an answer few minutes before, but I lost... like yesterday)
Again:
As far as I understand, are you going to record yourself your samples?
My experience:
I thougt the samle CD with *.wav files expensive, that is why I visited two churches and recorded the pipe sounds note by note, register by register.
I listened the result and the sample CD has become cheap! :)
So, I bought it.
Especially, in your case, your instrument, the cornet has much more modulation possibility, than a pipe organ, even if you have a studio, with experienced and disciplined musiciens, you will spend a lot of time with the recording, and I do not speak yet about the value of the studio equipment, the microphone... etc.
Brgds