It depends. With an eye on approaching summer in the Northern Hemisphere, you just can't beat the performance of a Delta 38 cfm 60mm CPU fan on the Alpha PEP-66.
However, the Delta 38 is the loudest and most annoying thing I've ever heard inside a PC case. After listening to the Delta 38 cfm on my PEP-66 for six months, I'm removing my PEP-66 and replacing it with a GlobalWin FOP-38. Further, I've removed the Delta 38 from the GW and will replace it with a 42.5 cfm Sunon 80mm case fan.
This will probably not cool quite as well as the PEP-66 with the Delta from hell. I'm adding a 120 mm intake fan and 92mm blowhole to my box, too. Hopefully I'll only lose a hair of CPU cooling power, but frankly the Delta 38 MUST return to the hell from whence it came.
I also have a P3B-F with an Asus Slocket on it. I'll lose an extra Dimm slot. The PEP-66 gives you three free Dimm slots, but the GW only gives you two free slots. To get rid of the *&)@+@#!!** Delta 38, it's worth it.