My old house(3000 sq feet) needs the popcorn ceilings painted. A friend said I could use a thick nap roller, but I've read that it produces less than great results. I am about to purchase an HVLP sprayer (probably the Wagner Finecoat sprayer)to paint trim and doors. Should I also use the sprayer for the ceilings or is that too large a job for that sprayer? Should I purchase a larger sprayer or stick with the roller?