Far from perfect, but using Simba's backtest spreadsheet http://www.bogleheads.org/forum/viewtopic.php?t=2520 with allocations of 25% Small Cap Value, 7.5% gold, 67.5% 5 year Treasury wouldn't be too far adrift perhaps from that allocation/strategy, and which yielded yearly total gains of :
AIM'ing the SCV stock might reasonably add a bit too that 10% annualised (5.36% real).
I could quite comfortably live with those returns and infrequent worse year losses. Even more if adjacent years to those losses were relatively good years as they have been in the past.