Buy your own style,if its hardstyle you like and fits in to your set then why not get it?if its hard german trance or an uplifter,if it fits in to your style then use it.Hard house in my opinion you cant really have a certain style coz it never experiments,never pushes the boundries like hard trance, trance and hardstyle, its afraid of changing the style a little bit.
But some times producers try somthing different and it may not work,I dont buy hardstyle really ive always been into hard trance alot more,but soon somthing new will be pulled out of the hat...trust me ;)