If it were possible, I would have voted for all. Wenlin is really not enough to get used to all possible scripts with which we often have to deal. The grave embarrassment of "What's written on this wall?" has to be dealt with!
We might consider that if the current batch goes well, though it's tricky to find fonts with comprehensive character coverage in the less common scripts - we're having trouble with our Xing-style font already because of that.