Heatsink-Fan combo for AMD 64 4000+

Right now I have a 4000+ with a san diego core in an asus a8n32-sli deluxe with 2 gigs of corsair xms pc3200 (2x1 in dual channel). I am looking into overclocking and was wondering what would be the best heatsink fan combo. I am looking only to cool by air, no liquids.

 

Thermalright make some Excellant ones
These I listed with thier design will help cool memory & N bridge
XP-90 or XP120
SI-97a
SI-120
SI-128
Jab-tech has Great Prices http://jab-tech.com/AMD-Athlon-64-FX-Opteron-etc-heatsinks-c-169.html

The stocks HSF should be OK for some Mild OCing but use some good thermal paste, I prefer AS Ceramique

Best to keep your temps under 50C & OC the Snot out of it

I use a SI-97a with Panaflo H1b 92mm fan on a 2600 mobile 10x250 at 2500MHz, load never goes over 45c
Got a XP-90 on a X2 4200 also at 10x250 at 2500Mhz I get few peak's about 50c
I also have Opteron 146 using a stock cooler from my X2 4200 running at 10x276 at 2760Mhz never goes over 50c
The stock HSF from my x2 4200 is about equal to a thermalright XP-90 (this stock HSF has Heatpipes)
http://www.madshrimps.be/?action=getarticle&articID=399