Which Model to Buy?

I've been looking at various models of Kurzweils - PC88, Mark 12, K2500X. I am a composition student and would like to create recordings of my work. I am a classical composer and am interested in traditional orchestral sounds that are as realistic as possible. Also various samples of the same instrument. Eg. violin arco, pizz, spiccato, muted, etc...etc. Performance is a secondary usage. Would someone like to explain the differences in the above models and what would be most apropriate for my usage. Cost is an important consideration, but I do't want to spend good money to find that the instrument I buy is inadequate

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