From my experience back links are the last thing you worry about after writing relevant content, creating compelling Page Titles and Descriptions, submitting your sitemap to Google and Bing Webmasters and blogging consistently using the search terms that people use to find your business or service. Google knows a legitimate backlink as opposed to one from a content farm.
Legitimate backlinks from suppliers, professionals you work with or trade directories are enough..and don't forget to link to other websites too.
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Mike Blaney
Marketing Guy
www.mikeblaney.com for marketing ideas
www.inboxfx.com for email stationery
North Vancouver, BC, Canada
604-618-5512
800-568-8338