2 Constitutionally limited monarchy (Monaco)
3 Figurehead monarch, Limited franchise (19th c UK)
4 Figurehead monarch. Full democracy (UK)
5 Constitutional Republic. Full democracy (US, India)
6 Full Democracy. Fragile constitution(Venezuela)
I have a strong preference for # 3
A constrained monarchy with very limited discretion. A powerful parliament. But elected through a limited franchise (not more than 20-30% of the population)
But a very powerful upper house (not an emaciated one like the current House of Lords) elected through a very limited franchise