I've cut my expenses and invested the extra in index funds. Currently at a nest egg of around $300k which spews off dividends of around $500/month and is currently appreciating a bit faster than that.
having a portfolio that is entirely concentrated in the S&P will have less risk adjusted expected reward than one that allocates a bit in some other buckets as well (e.g. international shares). c.f. the book "random walk down wall street".