You poor thing...how do you sleep at night? Lol
Seriously though, any person you ask will tell you what they would do. This isn't always good unless you want to be like them.
Take the saw, put it in the box it came in and put it out of your sight for a while. Now... you have plenty of time to think on it without it staring at you trying to get you to make a rash decision. Eventually the right thing will come to you and when it does the saw will still be there the way it was when you found it to do so. Don't let hindsight come to you after you did what someone else thought was good for you. Time is on your side.