Now THIS is interesting! I wonder if a bad stick of RAM was the culprit in all of my Jaguar troubles? I recall my local reseller (ReStart in Victoria) saying that they had dropped all of their RAM except for Kingston because they'd had so many bad modules.
I think good quality memory (say, Kingston) with a lifetime warranty is probably good enough. No need to pay Apple's prices.
I'm not trying to diss Apple; their online business makes money on "extras" like everybody else. Dell charges a fool's ransom for memory as well. (I just had a friend buy a laptop from Dell Canada-$110 plus PST/GST for shipping, and that was 5-8 day delivery from Toronto. For a LAPTOP! I have sent 40 Kg boxes from Sask to Nova Scotia, $2500 insurance, 2-day guaranteed for $90).