Well did some searching and seems that you can get the Raybestos Loaded calipers for cheaper on ebay. $60.50 per caliper and that is with an $8 core charge and shipping included. Also 2004 Sonata rotors will work also if you can get them cheaper, they are the same as the Optima.
On another elantra forum there is discussion that the elantra master cylinder might not be able to handle the twin piston calipers as the bore and piston size on the elantra master cylinder is much smaller than used on the XG350 or dsm cars(both use the same twin piston 43mm PBR calipers). IIRC from yesterday the elantra master cylinder had a 1.5mm smaller bore compared to the XG350 master cylinder. I don't know if this could be remedied by installing better brake lines front and rear which can reduce hose expansion and force more pressure to each caliper piston?
Well, I got lucky and found a pair of front 07 Tiburon SE aluminum calipers with brackets, SO, I will be going that route. 11" rotors off a sonata will work with the Tiburon calipers so ill pick those up also along with some EBC red stuff pads.