Can you define "aggressive"?  What are your numbers?
CloudHashing is doing 30%.  Is That TooMuch/TooLittle/JustRight.  Presuming KnC Keeps the price about the same(or a bit lower) but improves HashThroughPut (HTP) with Gen2, 30% may be about right to be able to re-invest in a continuous manner. I haven't actually run numbers though.

I'm thinking that After 0% ROI (Payback) this might work:
10% Tithe
10% Off The Table, To Hard Assets
30% New Hardware Fund.
25% Hold
25% Play/Live?