CATAP, to answer your question.
There are two brands of sway bars for the MS3 that I know of at the moment. The COBB kit, and the Hotchkis kit. I have yet to install the kit on my car due to being out of the area at the moment. The reason why I picked Hotchkis is probably more geared to the color... =\ I like the COBB also, however I wanted to color match my springs with the sways..lol
I can't speak from experience but I've read great results from both kits; granted the user was only using the rear sway bar. That you'll have to do some researching on because I don't know all the answers.... although SwampAss does tend to provide the unusually best answers, although funny, straight and to the point... =D
Check out COBBs, and Hotchkis, and read up on some comparisons. I'm sure you'll find something that suits your needs.