What 'Ram' does my Mac Pro need?

Hi gang,
What type Ram (the actual code\serial name) would go into the specs below? I have a friend who has just returned twice to the dealer because the Ram the dealer installed was incorrect. I'd like to get it right the first time. Any help would be most appreciated.
Ben
Model Name: Mac Pro
Model Identifier: MacPro1,1
Processor Name: Dual-Core Intel Xeon
Processor Speed: 2.66 GHz
Number Of Processors: 2
Total Number Of Cores: 4
L2 Cache (per processor): 4 MB
Memory: 2 GB
Bus Speed: 1.33 GHz
Boot ROM Version: MP11.005C.B08
SMC Version: 1.7f10
Serial Number: G8711209UPZ

Also, the way memory is configured seems to not always be understood; sometimes two brands don't get along. And deal with someone that sells a lot of memory to Mac market and knows the Mac Pro.
Crucial is popular top-tier w/o paying Apple price, TechWorks, OWC, TransIntl, Kingston....
Micron/Crucial, Hynix, etc, but there are a limited number of companies that really make memory and the rest are resellers.
http://www.crucial.com/store/listparts.aspx?model=MacPro%288%2Dcore%29
http://eshop.macsales.com/shop/memory/Mac-Pro-Memory
http://www.transintl.com/store/category.cfm?Category=2646
http://docs.info.apple.com/article.html?artnum=304235
Tech Note: RAM Expansion
http://www.barefeats.com/harper12.html
http://www.barefeats.com/harper3.html
http://www.barefeats.com/harper5.html

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