I don't think you can go terribly wrong with VGSTX, although I wouldn't sell VWNDX if I were in your shoes.  PRPFX is another story.  This is one you should really stay away from.  The total return chart on PRPFX is deceptive.  The fund has only done well when gold prices are going up like crazy.  i.e., in the most recent cycle, since 2000: link.

For nearly two decades when gold prices were going nowhere (1982-2000), which is the normal state of affairs, PRPFX produced returns no better than cash. If you want cash-like returns, might as well go with the real thing. 

Best,
Oildog