I am planning to invest in Motu's Machfive, a virtual sampler (16 channels) which can import most sample formats (except Unity) ?

It seems quite expensive to buy all sample CD:s on the instruments that I want to simulate.

Does anybody has any recommendations on which sample CDs to get . I am only interested in samples of acoustical instruments, not synthsounds.

Is there perhaps a better alternative then Machfive on the market.

I will use DP4 and OS X for the purpose.