If you want to know what big ticket projects will be of the most value to you (and increase the sales price of your house), the answer is that it really depends on what you'd enjoy, when you think you may sell, and how out of step your home's finishing/repair is with the others in your neighborhood. Please know I'm happy to stop by and chat about this anytime. 703-303-2889
To start your research online, I recommend this article from HouseLogic which is based on data from Remodeling Magazine's 2015 Cost to Value Report (which is very data and add laden, but I have it if you'd like to see it). The short version is you'll get the best ROI from: a steel front door, things that add living space, things that increase curb appeal (like new siding, garage door), energy efficient windows, and kitchen remodeling. It's not cheap, but great kitchens really do sell houses.