Not necessarily the best for quick return (important if you're selling in the next year or so), but the best value in the long term. HouseLogic's "8 Most Financially Savvy Home Improvements are here
Sometimes trees die or outlive their location. It's unfortunate, but true. But before you fire up the chain saw, be sure to check with your city. Many require permits and there are fines for cutting without. City of Portland permit is $25 but the fine can be $1,000. Also consider leaving the whole job to a professional. This is one of those jobs that may look simpler than it really is.