Normally 1 Defensive Unit per City in my Possession,
20-50 Ground Attack Forces (For Example Cavaly and Artillery) depending on Era (more Forces in industrial/modern times), Nation size and Diplomatoc Relationships (War, now War? Actively trying to seize enemy Terrain or just defending? etc)
After the Discovery of flight usually 1-10 Fighters/Jetfighters and 10-20 Bombers
Oh and I normally play huge Maps
20-50 Ground Attack Forces (For Example Cavaly and Artillery) depending on Era (more Forces in industrial/modern times), Nation size and Diplomatoc Relationships (War, now War? Actively trying to seize enemy Terrain or just defending? etc)
After the Discovery of flight usually 1-10 Fighters/Jetfighters and 10-20 Bombers
Oh and I normally play huge Maps

Smaller cities might not need that much, but 2 seems to be good regardless of city size. After that, focus heavily on offensive units. Their mobility will make them better than defenders while in your territory (because of roads), and they can take enemy cities effectively and quickly. I don't make artillery unless I expect an infantry attack, but I tend to avoid war in that time period anyway.
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