Hi Macnab
For the serious thru-hikes paper map and compass will always be the most reliable. No batteries to worry about etc.
But as a convenience factor I have been using my GPS watch mainly where I upload maps on there. I plan my routes on Google maps and Movescount and then load the track on my watch. The Etrex units are very similar to this but definitely cheaper so this falls into the category of not breaking the bank compared to the premium GPS watches. It should cover your needs for being able to navigate on the serious hikes.
Hope this helps.