wheel - 2:42 pm on Oct 15, 2010 (gmt 0)
1) look at what sites ranking in your niche are doing. Are their links reciprocal, or one way?
2) what I would consider to be the high end SEO outfits seem to use one way links. Different ways to do that, some use directories and similiar type of 'guaranteed approval' links, others have crawlers that look for sites that will give out relevant links. Either way, likely to be more expensive.