sorry i should have been more specific knowing you'd show.
i'd go for junk bonds and corporate bonds and yea as you say avoid government bonds unless you have a distinct convergence strat going. and i suppose yes it is a ponzi scheme but it's one where the price of loosing (be it inflation or default) for the government is just as high as the investor.
but lets not fool ourselves the bond market is a market just like the equity market but based on principles of ability to repay the interest and principle (however that said junk bonds to behave a lot like equities) instead of a random thought on what that company may be valued. so it still has the ability to crash horribly like the stock market . but the bond market is one that is on average more stable, there is a greater understanding of the fundamentals, (i feel) a greater regulatory and ancillary infrastructure surrounding it, a constant reference point in government paper, it's ability to be structured and restructured, the use of swaps, options and all manner of financial trickery make it far more valuable, and more interesting, than equities.