Todd, I use a G Loomis 964C 8' rated at 12-25. They also make a 904C which is rated the same with a 7'6" length. Like Tony said, what is best for you will depend on your preferences and style. I suggest you stay in the range of Medium Light Power with Fast tip to Medium Power with a Moderate tip. You don't want to overpower Halibut, and you need to account for headshakes. Check out this article for reference.
http://www.tacklewarehouse.com/guides/rodselection.html