The Antec 900 has two 120mm front fans, one 140mm top fan and one 120mm rear exhaust fan. There is an option for a 120mm side panel fan, but the heat sink does block that one.
I replaced all the Antec fans with fans from Noctua. I cannot hear any of them.
There is a gentle whoosh from the case and that is all the noise there is. Quite pleasant, actually.
EDIT: I should say, there are better enthusiast cases out there. This case happens to fit into the hole I have for it and still allow enough space around it for airflow. While I do not feel I compromised on my goals, I did not desert price/performance expectations either.