Al-Sabuni's Safwat al-Tafasir really is great and sums up the essentials of all the major tafasir. It doesn't seem to command as much authority among the Muslims in the West, probably because it is not yet deemed 'Classical' or 'Traditional,' which seems to be the trend here. But if one were to stick to it, one would have the essence of all the major tafasir. If also serves as a great bridge to some of the others. As you may know, some of the tafasir are extremely complex and difficult to understand, which is quite ironic when you think about it.