Ireland, in the naive hope that I can build a colonial empire and end up as a secondary world power. Also I have decided to use Ireland for first AAR. Work with what you know.
After Ireland, I'd like to try out China, Japan, USA, Prussia, France, some Italian minor... so many countries to choose from...
If Ireland gets free it's actually in a pretty good position. Huge populatuon (pre-famine years we had 8m), really only one enemy to worry about, and fairly homogenous population.