Paul Krugman makes an interesting comparison at his blog:

Now the real thing has been scored — and it’s OK. Something like 97 percent coverage for people already legally here, at a total cost somewhere in the $1 trillion range. Bear in mind that the Bush tax cuts cost around $1.8 trillion over a decade. We can do this — and have no excuse for not doing it.

Tax cuts for millionaires and billionaires = $1.8 trillion.

Health care for everyone = $1 trillion, at most.