You have to request it, then you'll have an initial info gathering meeting, they'll prep a pretty in depth plan for you that takes into account your anticipated retirement date etc.... It's worth it to see the big picture, and they'll give advice on how to tweak allocations, etc...
I only have the pre-tax option for my 457 so I've never investigated the pros cons... I would probably do that anyway to lower current tax bill and since I plan to withdraw an amount that will put me in a lower bracket in ER... I'm planning to use 457 and Roth principle (if needed) for the years before I hit 60 and can access the 403/401's...
Good luck! Having access to regular retirement account, plus match, plus 403, plus 457, plus Roth is a sweet situation... Take advantage of it : )