Adda's are great fans! They aren't papst but they will do 
 
It depends really what numbers what your looking for, no manufacture is good everywhere. Just pick whatever fits, just stay within the line of the top manufactures. Most of those fans last for 6 years or more if ran continously so really no worries.
BTW on my page I added some of the new line of sunon's in the 80mm sizes. (don't expect buying these anytime soon, just look 

 the B2 (2)H series are nice)