I would say the PAL6035 is better. I have used both, and the Alpha seems to keep temps a bit lower. It is not a LOT better, but slightly I would say. If the slight performance is worth the price is what you have to decide. Personally though, I would just buy a bare Swiftech 370-0A (think thats the right model) heatsink for about $30 and put the 27 CFM fan on there. That should give you about the best cooling you can buy for a 60 mm fan.
Aaron