Welcome to MouseBuzz
I agree its around 20- 30 min taxi could cost around $50
here is quicksilvers site you might find more info for the price here
Quicksilver Tours & Transportation : Orlando airport Disney World transportation.
we use quicksilver and find them very friendly also we book all our taxi trips in one go (universal sea world) and they take the payment at the end from the credit card.
its usually cheaper if you book a return trip..