Best money invested was my Delorme P-40 GPS. Can't say enough about it's mapping capabilities.
Worst money thrown away was a bino/camera combo. It was a while ago and don't remember the make but it had about a .5 MP camera that had no stabilization along with poor quality pics that made it useless.
One of the most important pieces of equipment that you will take hunting is a good quality pair of optics and they take some care to give you the performance that you want. So here are a few tips.
Use some alcohol and cheese cloth to clean the lenses. I will usually pick up an extra cleaning kit from my optician when I have my eyes examined.
Don't touch the lens with your fingers. If there is a stick or a bug on them blow it off.
Use the lens covers. They are there...