That really depends upon the size of carp you're after and the type of venue and the distance you will be fishing. And the time of year too. On the average commercial in summer, you'll be okay using a 12-13ft waggler rod as there are unlikely to be any snags that you'll need to steer the fish away from. If the commercial is snaggy (overhanging trees, lots of lilies, marginal reeds etc) it's likely that the venue is well established and therefore the fish might be quite large. In this case you will need a 13-14ft Power waggler rod to give you a fighting chance. The same applies to feeder rods - a medium will be okay in clear waters, while a power will be best in snaggy waters. In winter you will be able to use a slightly less powerful rod as the fish won't fight so hard and the weed will have died back. But if you are solely targeting specimens you ought to kit yourself out with true carp rods of a test curve of at least 2.25lb. Use a 2.25lb or 2.5lb test curve for short to medium range fishing, and 2.75lb for medium to long range work, and 3lb-plus for very long range work or for medium to long range hit-and-hold fishing in snaggy waters.