The best is not usually the cheapest to run. The cheapest cartridges are Epsons but the ones I have are slow and a bit noisy. Good picture quality though and cheap to run. And I don't really need fast printing as I don't do that much and I am happy enough with Epsons.
Look in the latest PCA magazine and see what they are recommending and then check the prices of the cartridges and then make your decision.