Little bit of background: I'm 34 in an academic attending gig, making about $330k per annum. I've been maxing out my 401k, but now I also have the choice of maxing out my 457(b) at $18.5k. Usually, that's a no-brainer as it will help lower my taxable income (and I don't have a lot of other things that help lower my taxable income, besides a modest mortgage), but I'm concerned that the market is over-valued and it may not be wise to be so heavily invested in it. Granted I won't be taking it out for another 30+ years. Any thoughts? Should I just do half of $18.5k?