Thanks for the clarification on the type of linking.
The Occulist, Zigner, HomeGuru, or others, probably know more about this than I, but the linking you seem to want to do is not hyperlinking (which has been found by courts to be legal under most circumstances) but rather you want to "deep" link, which will totally bypass your website homepage and go directly to the BBB site.
Deep linking creates more possibilities for a lawsuit. The Court said, in Ticketmaster Corp v Tickets.com, that deep linking is not copyright infringement, but deep linking could be a trademark infringement and, in some cases, unfair business practices. Suits have been filed, by National Public Radio and others, against websites who deep link.
And, win or lose, lawsuits are always expensive. Using a hyperlink or using a URL on your website is definitely legally safer than deep linking.
With the purchase of nameofcompanyinc.com, as you said was done in anticipation of a website creation for the company, legal issues could arise with the local company if you had an agreement (verbal or written) with the company over the purchase of this domain name. Is the domain name registered to you, yourbudweiser? Was it registered AFTER your falling-out with the company, or before? What agreement did you have with the company about the domain name and the website?
Even if the local company has a federally registered trademark on its name, you could still have the right to the nameofcompanyinc.com domain name, depending on any agreement you made with the local company. BUT, the use of nameofcompanyinc.com could violate the local company's trademark rights if it leads to consumer confusion (which, in turn, could lead to the termination of your use of the domain name). And if the purchase of a domain name can be shown to have been in "bad faith" (the purpose of which was to sell the name or use it in a nefarious way) the domain name can be taken away from you under federal law.
One final potential problem with your nameofcompanyinc.com could come from dilution of the company's trademark through your use. If your use tarnishes the reputation of the company or you use it purposely to trade off the name of the company, the company could stop your use of their name. Most dilution actions are brought under federal law (although it can be possible to sue under state statute, as well).
Telling the truth about a company, as HomeGuru said, is perfectly legal, as long as you can support this truth through evidence. Expressing opinions about this company is legal, as long as you stick to opinion that does not imply any false fact. Using deep links and company name domain names can also be legal, under many circumstances.
But, the local company can sue you anyway, as could, potentially, the BBB.
All in all, yourbudweiser, I am thinking that your plan to use this website to attack the local company over any real (or perceived) wrongs is a big legal risk - and you should consult with an attorney in your area to go over all of the problems you can face.