An independent judiciary, a strong civil society and an effective bureaucracy are far more important to social stability and economic development than the application of Jeffersonian, Hamiltonian or Westminster principles.
In substance, I abide by the traditional formulation of the role of the state, which is to provide peace, order and good government. Governments should do what they do best - in Paul Ormerod's words, "Governments should do much less...detailed short-term intervention...and [spend more time] thinking about the overall framework." They should shun ideology and focus on making the environment right for us to go about our business, while being mindful of the consequences of allowing too much freedom.
Strangely enough, to allow citizens and business the freedom they crave, good government must contain an element of regulation, it must, in some cases, in some ways, restrict freedom. This is because regulation is an essential ingredient of governance and, in turn, governance is fundamental to the success of the modern state and of modern economies. Maslow developed a "hierarchy of needs" for individuals. The higher needs in this hierarchy become relevant as a motivator of behaviour only when the lower needs are satisfied. Once an individual has moved upwards to the next level, needs in the lower level will no longer be a priority. I think this model is applicable at the societal level as well. I think a similar pyramid or hierarchy of needs can be constructed for society as a whole.