the anchor text does not change a link at all. By moddifying the text you are simply just changing what is displayed and wat is idexed, if that makes any sense.
From my experience, varying the anchor text helps it all look more natural and I don't see any high amount of inbound links hurting a site. But if fifty thousand websites linked to Digital Point Forums when it first started out with anchor text Best Webmaster Forum they wouldn't be wrong, that's for sure.