I defiantly would like to see an Oberon as a controllable boat they were good subs and i have been on a couple of them, they could also easily make a swiftsure class they were extremely similar in nearly every way to the trafalgar's.
The broadswords would be a great frigate too, you could make quite a few frigates from that sort of era maybe even a Krivack class but hey im not mod guru i can just about turn the computer on and off