as long as your really happy with the final productions id suggest contacting a few hardstyle labels through email/phone and informing them you have a demo that you would like to send.

i dont know how many tracks you have done for this cd but if theres quite a few id suggest picking the 3-4 that you think are strongest.
If they like those they will probobly ask you for more anyway.

if you think your tracks have a similar sound to current releases on a label perhaps it would be best to try those labels first.