Thanks 'carpecc' for your useful insights.
I'm in the same boat. SAIS gave me $10K first year, SIPA nothing and UCSD IR/PS a full ride, and I'm weighing all of them up carefully. I have a China regional focus and am interested in going into the private sector post-masters, so I like SIPA for that, as NYC's job market is more wide-reaching than DCs. Having said that, SAIS also sends a lot of people into the private sector too, albeit, more into the DC government-type of consulting.
One thing about IR/PS that is jarring, is how bad California's economic outlook seems to be. I've spoken with some IR/PS folks, and they do seem to have a decent network in DC (World Bank, QED group), it obviously can't match up with that offered by SAIS. But unless you go private sector, and even then, not having to worry about school debt is a massive benefit. I'm not sure how much more money a SAIS/SIPA MA is worth over an IR/PS one, but $60K sounds a lot to pay for prestige. I think all of them offer fairly solid quant backgrounds, which is what I'm after, with SAIS being strongest, as all students must specialize in international econ. By forcing you to focus in econ, SAIS makes you choose between technical specializations (for me, i-development), and regional ones. SIPA forces you to take a policy focus, with regional among a variety of second specializations. In that way, they are somewhat different in orientation.
In terms of China, only IR/PS and SAIS have China specializations. SIPA's is more general, though its China offerings look robust.
In terms of management, only IR/PS offers a specific focus.