Another alternative you can consider if you have the time / knowledge for it, is to trade BTC like you would on a Forex market. The short term volatility on BTC is huge, the value swings 5 - 30% per day. If you locked in even just 5% a week in ROI on your trades (which is possible imho) with a portion as a long term holding purchased on lower prices, you would be generating a significant amount for your fund (5% / week is a return of 1867% over a year of trading plus additional gains from growth in the general value of BTC) while remaining fairly liquid. Most short term trading principles employed on the stock / forex market can be applied on bitcoin markets as well.
Ya I pretend im a forex daytrader on BTC-e.com