Answer: Power raking would be the most econimical strategy; adding topsoil to the low spots would be the next. With either, you'll want to overseed. So it comes down to how much labor you want to invest. If you have the time and energy, rent a power rake. You can then even out the low spots by raking the higher areas into the lower areas.
Best wishes with your huge, huge project!
Q&A Library Searching Tips