You can refit your existing heatsink with an 80mm fan if you choose to. If you look at your heatsink, the <A HREF="http://www.globalwinusa.com/products/fop32_1.html" target="_new">Globalwin FOP32-1</A>, you can see that you can use machine screws between the fins to attach a 80mm or 92mm grill. After the grill is attached you can screw the 80mm or 92mm fan to the grill.
If you look at the link I posted above for the Delta 80mm fan, you can see that the model ASB0812HH-F00 operates at 3250rpm, with 37.43CFM, and only produces 34dBA. That is 11CFM more and 2dBA less at a lower speed than your current fan. That <b><i>could</b></i> equate to a 2oC to 6oC temperature decrease. You could go to the <A HREF="http://www.deltaww.com/products/dcfans/pdf/AFB8080254.pdf" target="_new">Delta model AFB0812SH-F00</A> which is an 80mm fan that runs at 4000rpm, 46.62CFM, but gives off 40dBA. That would be 20CFM more for the price of an additional 4dBA's.
So the choices of combinations are limitless. All you have to do is determine what your cooling needs are, overclocking, etc., and what sound level you are looking for. The rest is just finding the fan and heatsink combination that you want. Like I said before, you can still use your existing heatsink if you like. If you are extreme in your overclocking than I would suggest one of the heatsinks I listed above. They screw into the motherboard which is a little more difficult to set up initially but will provide a very stable base for larger fans and the weight associated with them.
The <A HREF="http://www.micforg.co.jp/c_pal8045e.html" target="_new">Alpha PAL8045U</A> comes with the <A HREF="http://www.deltaww.com/products/dcfans/pdf/AFB8080254.pdf" target="_new">Delta AFB0812SH-F00</A> and the <A HREF="http://www.swiftnets.com/mcx462.htm" target="_new">Swiftech MCX462</A> uses the <A HREF="http://www.deltaww.com/products/dcfans/pdf/FFB808038.pdf " target="_new">Delta FFB0812SHE-F00</A> which is a dual fan design. (4900rpm, 68CFM, 48.5dBA…loud in my opinion. It also weighs 170grams.)
If you got the Alpha 8045T and the Delta FFB0812SHE-F00 it would be one extreme combination, not to mention a very heavy combination. That is why I suggested my choices for heatsinks. Your heatsink would not handle a fan of this size nor the torque produced by the weight of the fan on the chipset. The force of the airflow down onto the heatsink <b><i>might</b></i> detach it during operation since it only has one clip.
Like I have stated above, you could use your existing heatsink with a normal-sized fan (a light 60mm or 80mm) and a grill.(80mm) This would be the cheapest retrofit solution. If you are going to switch heatsinks and fans altogether the next cheapest would be to buy one with a fan included. The most expensive would be to buy a heatsink and a monster fan.
<b>"Kenny! Give me the whoobie."
"You don't feed a baby chile!" - Mr. Mom</b> :lol: