I'm replacing some fascia boards, I am looking for something that is rot-resistant but I am hesitant to use pressure treated lumber due to shrinkage as it dries out and I don't want gaps (project has to be done over a few days).

What are some good wood alternatives that are competitive in terms of price/performance? Hopefully I am not asking for too much, but if you could list the alternatives in terms of relative price that would be awesome.