T-Road is a real good ball for straighter in oil. It can also handle mediums to medium heavy so it can be played a lot more than the typical heavy oilers. So Bigtymer is right about it being a good benchmark. But that's what makes it a great ball. But, if you want to have one ball just for the heavy because you have the other volumes covered, then a Virtual Gravity would be a good choice, in my opinion.
