If you want the ultimate, ULTIMATE soprano showstopper, you MUST turn to the opera literature.
If you are truly a gifted coloratura, you will kill them three times over and have them eating out of your palm with:
The Bell Song (Ou Va La Jeune Indoue?) from Delibes' "Lakme": 8 minutes, three octaves, staccato scalar runs, trills, no less than three high E's.
"Der Halle Racht" (Queen Of The Night's Vengeance Aria) from Mozart's "Magic Flute": sixteen staccato high C's, FOUR F's above high C, and a FIERCE triplet section that requires incredible vocal flexibility and melismatic clarity.
"Il Dolce Suono" (the Mad Scene) from Donizetti's "Lucia Di Lammermoor": two high Eb's and lovely vocal cadenza
The ultimate in rangy:
"Popoli Di Tessaglia" by Mozart...several fast ascending scalar runs, culminating in the only written G above high C in the entire operatic literature.
Have fun
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