any class can finish the game in fine form. the game is just THAT well balanced.
the most IMPORTANT thing to do, is play YOUR favorite classes. heck, you can play a party of Faerie Ninjas if you adore them. granted it may be a tad hard
however, if there is anything your post has proved, is that everyone has different ideas on the perfect party to finish. they all finish. the point is that YOU have a blast getting there!
so, just listen to your heart!
V***V