WE might be upgrading our ram, probably an extra gig (we only have one), and have some questions. Does it matter what brand of ram you get? I was looking at this: http://cgi.ebay.com.au/Apple-iMac-I...3286.c0.m14&_trkparms=66:2|65:1|39:1|240:1318 He says he also has Kensington ram, what is the difference? Is that ram good? Would it work with our 20" iMac, the generation before the ones that just came out.