I personally like bitcoin right now as my primary investment choice because, although there is manipulation, it is the most transparent store of wealth and market that I can think of.
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I see gold as a solid place to hold wealth, not an investment, and bitcoin as a good storage of wealth as well (with unique problems) but with explosive potential upside.
This is why we are bullish on Bitcoin, the smart money... the clever investors know that the potential upside is WELL worth a small allocation in their portfolios because of diversification.
See this paper explaining that the Beta correlation between Bitcoin's price and other asset types is simply nonexistent. IE. it is a new and unique asset class that does not follow correlations against other market instruments.
http://www.scribd.com/doc/294784691/Estimating-the-Beta-of-Bitcoin