People forget that on the OEMS, you don't get a 3-year warrantee like the retail box. My old retail PentiumII 300 mhz died two years later, and Intel promptly replaced it with a 600E that happens to do 155 fsb on air (936 mhz)! So the warrantee does matter.
Also, I am in Japan and the OEMs will not get as good a used price as the boxed units. Most of the boxed SL6EFs will do almost as high as the SL6RZs (maybe 3.2 gig), but just need more voltage, like 1.7-1.75. But 3DMarl2001 don't care what voltage you are running.
Also, there is too much emphasis on how high a fsb you can get. With DDR boards, that means nothing if you have to run your ram 1:1 or relaxed CAS settings like 2-3-3-7. You will get higher benches running lower fsb but better memory timings.
Believe me, going from 167 fsb/3.01 gig to 178 fsb/3.2 gig doesn't make that big a diff as you think with 3DMark2001 unless you can improve on memory scores. With DDR the memory performance goes up geometrically over Granite Bay boards, e.g. DDR445 at 167 fsb versus DDR475 at 178 fsb, and if you can maintain the 2-2-2-5 settings you will see a tremendous increase in 3DMark scores. I found going from 167 fsb to 178 fsb on a GB board only increased my 3DMark2001 score by 290 points! Very disappointing. You can get more points than that by overclocking your 9700 Pro by 20 mhz.