Let's add some more info:
Rio pump
Max head: 5 feet
flow @0: 211 gph
Power: 12 Watts
(not too shabby!)
U-Haul tranny coolers here
(Not bad!)
The first thing to check is if the block is mounted properly. The application of the Arctic Silver (or other thermal paste) is the biggest factor. Normally, you'd only apply a razor thin layer on the CPU core, and the block.
You mentionned that the pump is buzzing, and that's due to a high flow restriction:
1-fix the impeller. (run search here, same as for the Eheim 1048)
2-too much pressure, switch to 1/2 tubing. Doesn't this pump have 1/2 inlet/outlet?
For fan, I'll be using a blower, instead of an axial fan. I'll post pics when I have it.
All in all, it's all a little more involved than you might like, but hey, it's a watercooler...