You are very fortunate to be so close to such a warehouse of astounding collections!
Anyway to answer your question, I would search for figures or busts that strike your fancy. I would not hold myself to just one or two either, but then again I don't know how much time or any other restrictions if any you have to devote to your hobby. Some folks stick to a given period, and that's fine, its personal taste and preference. Myself, if I come across something that causes me to have that,..... 'Oh hell yea, I'm gonna do this one!'.......feeling, then I just go for it. It seems you favor those two periods for subject matter, not to mention you already have references for them, so I'd more than likely go for one of each if not more. I can't imagine you having any problem in finding several!
Joe