You really can never have too much light. It adds to the overall feeling of a home as well as makes things like reading, cooking, etc. easier. It seems the kitchen and the bathrooms are often most overlooked when it comes to adding lighting. Think of adding both overhead and wall lighting.
2) Pay special attention to the kitchen
The kitchen is the hub of the home. It is where you cook, clean, spend time prepping, and entertain guests. It is important not to skimp on high quality appliances or finishes. Go ahead, spend the extra on those appliances you want, or the more luxurious cabinets. It really will be worth it in the end.
3) Closet space
It is highly unlikely that you have ever heard someone complaining about too much closet space. Adding more shelves, a few more square feet, etc. to a closet is well-spent space.