What would the best government be if you wanted to create an emperor? Also to add in some type of lower forum of government so that the lesser nobles feel important?
Define Emperor? In reality all the government forms can be made the same, strangely enough. As ruler, be it a tyranny or democracy (I even think) you can set election rules. So a tyranny could be appointing a new tyrant every single month, or a Prime Minister could in effect remain in power for ever (although I didn't check this one, it should be true).
You could easily make a Republic of some sorts, where the ruler doesn't get re-elected but all other positions are. Then hold referendums over (trivial) things so that everyone has a say in realm affairs. Attracting and 'entertaining' new nobles can be done in a lot of different ways and never really depend on the government type if you ask me.
