Cabbages prefer a pH around 6.5-7. Normal potting soil will be adjusted to this pH and probably sterilised. If you are planning on overwintering them you may need to take into consideration two things. They will get top heavy, especially when they start forming heads, so bracing the pots will probably be neccessary. When it gets cold don't allow the roots to freeze (which they will be prone to do when in pots) as this will result in the leaves probably dessicating and dying, particularly the main growing point.