personaly on the pumps id go with the DDC. quiet, tested, and has 3/8" native. plus im pretty sure its less expensive which is always nice. You can also buy tops for it later if you want to go to 1/2" tubing.

I personaly am aiming to do the same with the x2's. :p. should be sick.

Those Pabst fans ive heard are excelent and last forever. Vapor has a sticky up on fans at the top of the forum. its great to help pick the best ones for your application. Yate Loons are nice cause they blow a good amount of air and are super cheap, may not be the best bet for the horizontal rad on top though cause the fan has sleeve bearings and will start grinding.

hope this all helps