As someone who has been contracting for years and flipping real estate, I like to advise my clients that when do renovations, flat ceilings throughput your house will give you a really good bang for your buck.
Houses with stipple ceilings are now dated and when converting to flat, you now have the opportunity of running electrical for lighting, theater and sound. When done, the transition is astounding. From then on, you can decide on what room to paint, what room to start with trim and so on. I have a general rule that you should work from top down. Fix your ceiling first, paint and then floors.