Radiator hoses

So, I've finally gotten around to investigating a leak from the radiator hose and the water pump connection and I think that I've found the cause. This is the first time that I've had to replace a radiator hose on any bike that I've owned and I was wondering if I should go for OEM or after market... any suggestions? Also, the connection to the aluminium water pump will need a clean, so I was thinking of using some wet & dry, unless someone knows of a better method.