Assuming your irons are to spec, with the PW being 45° I'd suggest going with 49°, 53° and 57° wedges. However, I've noticed the 9i is supposed to be 40° - so a 50/55/60 might be better (to keep yardage gaps more similar to the 9-PW gap).

As for steel or graphite? It's up to you. I'd probably go with what's in my irons.