double, with big fan?

okay, so im thinking about buying a water cooling system, to replace my fan system.

Question one...

i have a DFI board and im thinking about water cooling both my CPU (AMD 3800+ X2) and my (north bridge or my GPU, haven't decided yet.)
I was wondering if it might effect my water cooling system if i used two 80mm radiators on one system or would one do just has good?

Question two...

http://www.newegg.com/Product/Product.asp?Item=N82E16811999612

go there to get an idea of what my question is talking about
I was wondering if this fan was powerful enough for the water cooling system im about to put in my system?

are you using 80mm rads? If so, I would recommend against it.

If you must go with 80mm fans get good ones the you can under volt for high cfm/ low db's, like these @ http://www.excesssolutions.com/cgi-bin/item/ES3556
Most folks are right in telling you, if you can, use 120x2 rad for muti component cooling. 120x1 will cool cpu only great, but once you add more (gpu or northbridge) the small rad will not keep up without fans that are so loud (60db or more) that you will be deaf.....eh? ......what did you say? .......can't hear you over my fans!!

EDIT PS: I found this thread and the folks here have mad very valid points regarding 80mm rads.
http://www.ocforums.com/showthread.php?t=489590

80mm RAD = stick to air cooling

You need a 120.1 for a CPU. If you want to do a CPU, Chip and/or GPU then get a 120.2 rad. If you want to do CPU and 2 GPUs you can get by with a 120.2 but I would suggest a 120.3 it would even handle a chipset too.