The great thing about french brands is they offer good value for well tested products. La Roche-Posay is no exception. I think the main thing you'll notice if you upgrade your skincare routine from supermarket brands to mid-range pharmacy brands is, other than the price, all over face treatments (as appose to spot treatments) and alcohol free toners.
Effeclar Duo [+]
One thing about french bands are the confusing names. It takes a while to get used to each name for each range for each brand. Effeclar is La Roche-Posay's answer to acne. Effecalr Duo is a full face treatment (in the UK, its a spot treatment in the US). This is something you don't really find in cheaper brands, but there is a spot treatment if you feel you need it, and I feel it really makes a difference from blemishes and larger acne to scarring. Although I don't feel this will clear moderate acne unless another cream is used along side like Benzyl Peroxide.Serozinc
Again weird name, its a spray toner or spray onto cotton pad if you don't like being sprayed in the face. As I mentioned earlier: alcohol free, which means you can probably apply as much as you want without drying your skin. I think this complements effeclar duo, but if I could only pick one, it would be effeclar duo.
