It seems like those shampoos you mentioned have lots of silicones. Great if you have dry hair but bad if you have oily scalp. I would try using something without silicones. Doesnt have to be salon and not all drugstore is bad. London Drugs is selling Giovanni and Avalon which is normally found in health food stores. Speaking of which you might try Avalon if they have one with lavender in it. Lavender is great for balancing an oily scalp. Or you can get some lavender oil and mix a few drops with your shampoo to get a similar effect.

There is a thread on the Longhair Lovers forum which talks about using only conditioner to wash your hair. It works great and my hair doesnt get oily the same.