There really isn't something exactly comparable to the Hy-Road in the Storm line. The Rocket is closer but is something to ball down to when you need something cleaner through the fronts/mids. When the Cross Road came out, it was supposed to replace it and couldn't. The Fire Road couldn't replace it either.
The Hy-Road has been in production for over 7 years now for a reason. It's one of the best benchmark balls out there. I had one and enjoyed throwing it. Only reason I don't have it anymore is because I switched most of the arsenal over to Motiv.
My advice is this. If staying in Storm/RG, just stick with the Hy-Road. If you want to venture outside of Storm/RG and you can find a Motiv Sigma Sting, get it. Even though it's a pearl compared to a hybrid, it is virtually identical to the Hy-Road with its motion. That ball was retired a while back and can be tougher to find sometimes.