What CPU Fan?

[TopChip7]

hey guys - long time no speak!

got a 2nd 7900gt arriving in post 2moro and although both cards will have zalman vf900-cu fans i'm wondering whether or not the cpu will start to feel the temp of an overcrowded case and it's original amd stock cooler?

does anyone know which AMD Socket AM2 cpu heatsink & fan is actually the best for cooling???

i was looking at (but not limited to):

Zalman 9700 Super-Aero (Around £44 GBP)

and

Scythe Ninja Plus (Around £32 GBP)

Thanks