I second everything you said - except:
We should clarify that Fill N' Finish is no longer available under that name.
It's now Elmer's Carpenter's Wood Filler.
Christian, you might have trouble finding it under the old name, some places may still have some of the older stuff.
Be sure you buy the regular filler, it comes in a white tub with a blue and orange lid. There'll be a small 10-144 number on the lower right side of the lid. Stay away from the Stainable Filler, under the latest formulation it's very hard to sand.