You might want to invest in getting a more complete set of dumbells which will really come in handy in both workouts. I have a set from 3lbs. all the way to 25lbs. and I use them all. As far as your barbell, sounds like you have pretty much all the weight you need. If you want to buy a couple of extra plates (5lbs.), but really, what you have is fine. I don't think I have ever used more than 55lbs. on a barbell. Hope this helps.
Nadia