Arctic Silver 5 vs silicon paste

[Renesis]

I put an Arctic Cool Copper Silent 2L on my 8RDA with an Athlon 2600+ and used Arctic Silver5 as I figured that would be the best thermal compound for it. However, the Arctic Cooling web site staes this:
quote:
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For rough or uneven heatsink surfaces the silver or copper pastes are better. For our coolers the silicon paste is by far the optimal choice.
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What do you guys think? I have always used AS but I guess I could give their silicon paste a try and see if the CPU runs cooler. Has anyone used the silicon paste?

Thanks,
Kirk