I agree with Roberto. I'd add that Oracle's data dictionary is very cool for when you do need to tune, but by then you've probably outgrown postgres anyway. Oracle's SQL is slightly more featureful than Postgres's, too, but postgres has all the basics down. Once in a while I think, "this query would be nicer if i could use xxy feature of Oracle," but not often.
I guess if "money and hardware being no object" meant being able to afford hiring a DBA to keep Oracle happy without blinking at the expense, I would go with Oracle. But in the real world I am happy with postgres and am likely to stay with it for the forseeable future.
