Elantra Sport Aftermarket Wheels
Not 100% sure what the wheel specs of the Elantra GT Turbo will be but I know the bolt pattern, center bore, and lug size will be exactly the same as the Elantra Sport.
Center Bore: 67.1mm
Bolt Pattern: 5x114.3
Lug Size: M12 x 1.5
The ES has stock wheels of 18x7.5 +55 so I'm sure this would be more than enough info for you to find some great aftermarket wheel ideas.
Me personally, wouldn't mind a set of TE37s (I know, so common and boring) but come on... they look good on anything haha. But I would be interested in swapping tires first on the stock wheels and maybe change rims and tires the year after I've owned it.
What do you have in mind?