web audit/analytics company

Can anyone recommend a web audit/analytics company that is verified/accredited in the United States?  We are looking for at-least-quarterly, ideally monthly, audits that can be obtained through either analyzing our log files or by installing page tags across our site.  Ideally, we’d like to see pageviews, visits, and unique visitors both site-wide and broken down by website section.  Geographical locations, technical/system information, and referrals are important, too.  We need to submit our statistics to advertisers, so the reports must be verified.  In addition, we’d like to host an optional, yet official, demographic survey on our site allowing us to gather information about our visitors.  Some level of customization for this survey (ie: adding our own questions, re-wording existing questions) would be ideal.
vannyxAsked:
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mrcoffee365Connect With a Mentor Commented:
There are many good web analytics companies in the US.  I'm not sure what you mean by verified or accredited -- I don't think there's a national organization that accredits web analytics companies.  The closest I can think of to accreditation is Nielsen's http://www.nielsen-netratings.com/
and MediaMetrix (now ComScore):
http://www.comscore.com/

However, these are some of your options for web log analysis:

Expensive:
Hitbox (thorough, analyze logs and Javascript tags)
www.hitbox.com
HarvestInfo (expensive, analyze logs and Javascript tags, very ad-oriented)
http://www.harvestinfo.com/
Unica
www.unica.com

Less expensive:
.Net: LiveStats
All platforms:
WebTrends
ClickTracks
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