Most important states/kingdoms from every country

Hello!  I have been making an wishlist of modern and historical  issuers formy coin collection. Even though I  have some ideas myself could  you please  tell what kingdoms and states were that are part of  modern  the day countries are  worth  collecting  coins  as for hitorical importance (had real influence not just a random town) and a rather reasonable  price  to collect (under 10 dollars)
Heres  the  list of countries I need  issuer ideas from. I already have a list in mind  but if  you have any idea  let me know. All help is apreciated
1 Germany (already  have bavaria prussia baden and  saxony, wanting to collect westphalia,  wurtemberg, hannover and hamburg)
2  India ( already have the mughal emp, all  the colonials and baroda)
3  Italy ( want papal states)
4 Russia (Principalites, idk  which ones the most affordable)
 

Rus principalities were before Russian Czardom and Empire. Some of them were even ruled not by something that is modern Russia. You would be looking at coins that are over 500 years old, hard to authenticate and manufactured to very loose interpretation of standard. Significant Rus coins belong to museums and not to private collections.

From Italy, in addition to Papal States, I would have the Republic of Venice on my list, and Florence/Tuscany, though $10 might be tough.

For Netherlands I think something from the Dutch Republic era (1581-1795) would be a coin of historical importance, as they were one of the top world economic powers at this time, so a coin is the obvious symbol of that economic power.  Holland is the province that contained Amsterdam, which was the financial center.

Again, for historical significance, I would try to get a coin of the Habsburg era if you don't already have one.