Depends on the keyword or keyphrase. If it's a popular one it will be difficult to out rank other popular authority sites that have good anchor text for it already. Traffic is generally much easier, however quality targeted traffic is another story. Just keep building anchor text at any dofollow you can find, preferably high pr with low outgoing links, and related to your topic or niche if possible. A few good quality high pr dofollow's will generally out perform hundreds of low quality ones with hundreds of links. But I still prefer some dofollow links rather than none at all.