Best place to buy pre-tested overclocked T-birds?.. or do i really need one?

i have heard the Overclockerz Store absolutely sucks, and have been referred to a UK website, but is there any other domestic site that is reputable to deal with? i am going to be buying an Athlon T-bird 1.2 gig, and figure my overclocking chances will be greatly increased by buying a pretested proc. or are my chances pretty decent, anyway, with an Abit KT7A and a 256 meg stick of Crucial 133 ram? looking to hit, hopefully 1.4. what are the odds? thanks