Best Core2Duo CPU Heatsink For Under 40$ ?

Hi,
I am going to overclock my core2 duo E6400. I currently have my stock heatsink/fan but want to buy better cooling to get better results, however im on a tight budget.

I am ordering a bunch of parts already from directcanada.com, they give free shipping on orders over 300$ so i'd like to get my heatsink from there.

here is their heatsink selection : http://www.directcanada.com/category/?minorcatid=1428

I initially wanted to order this one : Arctic Cooling Freezer 7 Pro REV.2 21$
but it has been out of stock for a while now and I can no longer wait to pass my order. I'd like something equally good or better within the same price range, ideally under 30$. For sure I do not want to spend over 40$ ?

I really dont know much about heatsinks, but of course things that come to mind that seems important are:
-efficiency
-loudness
-ease of installation
... Importance goes in that order too i think... something well balanced... I wouldn't mind to sacrifice a little bit of efficiency/performance in order to avoid a constant air plane jet sound in the room when my computer is running ( my brother bought a fan... omg... i swear, the sound is awful )

thanks for your help !