Update: for your above..
parseFloat("15854420.40053001").toFixed(
;
parseFloat("15854420.40053001").toFixed(
;
your toFixed8 got converted to a smiley. I've used both methods, the float and just integer and count satoshis. I like the satoshi approach more when storing in my DB IMO. I agree. Usually use integers too. And I think I remember blockchain.info's API also works that way.