Really excited by this! Hope I have the chance to pick one up. I love the split spacebar hotswap support too.
Also, it's a lovely idea to hold a charity auction, I hope you consider the Breast Cancer Research Foundation as they are one of the better charities who support breast cancer research directly in many countries (not just the US) and last I checked nearly 90% of their funding goes directly to research. Or The National Breast Cancer Foundation who are dedicated to providing low cost screening and diagnostic services and direct nearly 80% of their funds towards those programs.
I don't know if they've cleaned up their act since, but probably one of the best known charities (Susan G. Komen) engaged in some very unsavory practices for a charity and only dedicates a very tiny portion of their funds to actual research.