I would suggest aluminum on soffets and facia too. Face it, at some point, you will wish that the two most critical areas of your home were alum if you decided vinyl.
Also, as so many contractors and home owners do, don't cover up and wooden problems with the siding, make the repairs now and that way you do not have to rip the stuff off and make the repairs as a person on this site has to do. That post is down the list about one week.
Also, make sure that the drip edge or roof edging is wide enough to bridge way over the facia for proper dripping and run off.