I believe I speak for many here when I say your wish to build a portfolio is what many are hoping to achieve here.
One of the great things about Mixoff.org is the many songs that are freely available for download here, so that you can start building a portfolio.
Also, you say that you have "very high end" gear, but don't describe any of it. Folks like to discuss gear too, so I recommend a description of what you're using and your studio setup.
Also, you say that you can provide mastering services, but a real mastering studio can be very expensive — are you sure you don't mean PRE-mastering?
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