Check with HR / plan admistrator before completely frontloading the 401(k) if you receive a company match.
You may have to be putting money into your 401(k) with each check in order to me "matched".
Last year, I checked with HR and told them my plan. I specifically asked whether or not the company would continue the match if I was done contributing for the year and I was told "yes".
Lo ad behold, when I stopped contributing (because I had maxed out the 401(k), the company stopped matching. I inquired again and they said Oh, sorry, you'll get a true up early next year.
It's early next year and I just called and apparently they're still "working on it". The silver lining is that the market is lower than it was for most of last year, so I'll actually come out ahead by having the "match" invested now, as opposed to buying in throughout the year last year when valuations were higher. That's just dumb luck though.