Go with the h22. You could always find a shop to build you an h23vtec, which utilizes an h23 block and h22 vtec head. However this can get pricey and in depth, it needs to be built right.
Try
www.thepartstrader.com for motors.
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget