QUIET CPU cooler

[Kanjika]

I've been thinking about upgrading a few things to sqeeze the last bit of power from my aging computer. Since i'm upgrading the CPU, i'd like to replace my TT Spark 7 with something quiet. It really is loud, even though i'm totally used to it (makes any game system seem like a whisper in comparison). Anyone know of any quiet, effective CPU coolers that would be under around 50$? Some say that they are quiet, but if someone could reccomend one from experience that'd be great. I don't mind the sound of rushing air, just the annoying hum some fans make. I would do water cooling but there's really no point in spending that much, and I probably wouldn't need it.

[Pyrion]

Something from Zalman, though it would help if you specified what brand and model CPU you're talking about.

[Effef]

Zalman CNPS9500

http://www.newegg.com/Product/Product.asp?Item=N82E16835118223

Scythe Ninja with a Nexus fan

http://www.svc.com/scnj-1100p.html

Nexus fan:

http://www.svc.com/d12sl-12.html

Im guessing you have a Socket 478 or LGA 775 Pentium 4 am i correct?