Well, Auburnfive, I think you are right in that you are trying to plan a bit too much. What has been said about taking a stop when you feel you need to or want to, is the best advice. However, there is much to be said for Sarria in terms of it being a good midway point for a stop-- there are a few interesting churches, comfortable albergues and hotels, and good restaurants, and you can take a seat in one of the cafés along the river and watch the pilgrims stroll by.
Alipilgrim's advice is good and you should really reflect further on this. Two other interesting stops, if you like the idea of a smaller place, could be Molinaseca, which is one of the prettiest villages in that part of Spain-- also with decent accommodation and food, and there are a few good spots for watching pilgrims walk by. If the weather is decent, there is a splendid riparian pool running through the middle of the pueblo.
For a very small spot, with nothing much more than the two casas rurales, look at Herrerias de Valcarce, very bucolic, where the air is clear and fresh, and you will be able to doze calmly and prepare for the next stretch. One of the casas rurales is well-placed to watch pilgrims struggle through, and the other has a terrasse angled so that you can ignore them and sip on your drink.
