Ya, there should be a pair of small arrows on the diameter. One points the airflow direction, the other points the rotations orientation...like that part matters.
In case fans, it may be worth a larger fan rather than faster. CFM is nice is nice in a case, as it translates to volume. I'm an advocate in the use of "air slugs" and "air streams" to demonstrate cooling conditions in a case. If you can make a good path of air (like a jetstream), it'll do more good than a high count of fans. But if you have that jetstream setup and can get more in that stream AND still maintain it...more power to ya.
I like big fans in the rear. Maybe just one big 120mm. Then the fronts just have to dump it in. The rear fan will direct the input and is usually close to the CPU and the AGP/PCIex16 slot where it's needed. A huge intake will just put a lot of air in there and not really do more than that.
Anyway, I'm rambling. If you can get 70cfm under control, it'll be more than enough to move a nice slug of air over your goodies. No, not THOSE goodies....Pervert.