You make a very good point about the sanding part. But here is what I saw is a disadvantage with the circular motion which shouldn't affect performance noticeably but it might.
When it's done in a circular motion, I would think that molecular rings would be made that can not be seen with the human eye. These rings would trap hot molecular gas in a way.
http://img209.imageshack.us/img209/8426/77348411qm4.gif
But when it's done in one motion, the lines that are made allow the air to relieve these gases of their heat.
http://img519.imageshack.us/img519/9782/a2tv2.gif
If I am wrong, please do tell because I really wanted to do it the circular motion way which should be easier :D I don't think that this will affect performance at all maybe 1C max.
About the Zalman, I dont know yet :p: . Price is more important than its performance currently IMO simply because when zalman made this thing, they knew it would be much better than the stock cooler (and that's all that matters to me). If it's expensive, I'll wait for G92 and see if it fits on that and make my judgment then ;)
http://www.digital-daily.com/video/7...si/index02.htm
EDIT: 100 Post Count :woot: