There is no such thing as a "standard" 54 or a "standard" 57. Your question is unanswerable without knowing the specifics as to how those two frames are measured - CTC or CTT? Compact or not? What size stem are you using now? How far behind the BB center do you sit now, would you be able to move a bit forward?

If you have the flexibility to ride with the reach of a 57, there are plenty of compact 57s that will meet your standover requirments. If your reach is just right on the 54 and you're using a 130 stem, well a 110 would bring you into spec.

Give some additional information if you want a serious answer.