This is the mirror I use on my commuter helmet and road/weekend helmet.
None of the new cyclocomputers, wired or wireless, make noise. Just get whichever one has the features you're looking for. You can probably find a decent one for under $15.
http://www.nashbar.com/results.cfm?s...ice1&pagename=
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.