If you want to ensure you have funds available in the first five years of retirement, there's no better place for it than the 457 plan! There's no early withdrawal penalty on this account, you just pay normal income tax on whatever you take out. In the 25% tax bracket I would probably prioritize this over a Roth IRA. My priority order would probably be as follows:
1) 403(b) up to maximum match
2) 457 up to maximum
3) 403(b) up to maximum
4) Traditional IRA
5) Roth IRA
6) Taxable investments
If your 403(b) investment options aren't very good, I might switch (3) and (4) in the list above.
Also if you plan to max out everything in 2016, remember that you have until mid-April 2016 to fund your 2015 IRAs, while the 403(b)/457 plans have to be funded by the end of 2015. That could be a point in favor of funding the employer-based accounts first even if the investment options aren't quite as good.