So much of what we want for the Slingshot is "where we live and how we ride" and what makes us comfortable when we ride. Short vs tall ... look over or thru .... how much air is right for ME. The best thing is to set in one with different shields to see what works.
I forgot to mention one annoyance with the MadStad/Twist Dynamics Single Adjustable windshield - having big ol' June bug hitting the lower edge of the windshield and then seemingly splattering all over inside the cockpit! Didn't happen often, but you definitely remember when it does!
The major Slingshot aftermarket sellers (DDMWorks.com, SlingshotOnly.com, Slingmods.com and AllThingsSlingshot.com) all hold sales around most US Holidays and will typically offer a discount around 10%, sometimes more, depending on the item. Tops are usually included in thsoe sales, although if you want a specific Top, you may not find it on sale during each sale.