Second collecting field

Hello, I am a numismatics from the Czech Republic. Now I am interested in Francis Joseph I. coins - particulary Krone currency (https://en.numista.com/catalogue/ruler.php?id=754).

I would like to add a second collecting "field" into my coin collecting journey, BUT I DON´T KNOW, WHICH. *connected to Bohemia.

Obviously, I could collect some another monarch from Habsburg/Habsburg-Lothringen dynasty, but it looks almost the same. If I would like to chose some Habsburg, I don´t know, which one. I don´t care. 

Another option is a czech medieval age - Kingdom of Bohemia, but I heard that it is pretty hard to collect it and there are many counterfeits.

Are there any other options connected to the Czech Republic? Please, something older than Czechoslowakia - I don´t like Czechoslowakian coins.

Maybe, what do you think about collecting "Habsburg coins from the 19th century?" Are there any specific issues?