ok so there are many that I like production wise but as for dj-ing I'd have to say Mondello is one of the best I've heard so far. flawless mixing and mixing with originality I must say. and to top of his crazy mixing he adds in some of the most technical fast paced scratching I've ever heard. although, some of his tracks don't get me going, but I can't definantly appreciate the skill. then the Prophet has imo the perfect hardstyle feel. he nails it dead on and for what he lacks in his skills he makes up for in style.

LOTS OF LOVE
DJ Chi-Gu Kom
P.S. I like many others but I'd have to say that these 2 are the most impactful