If you are looking for long term links I would suggest paid links. I am not talking about buying monthly text links I am talking about investing some money to get links. Here are some link suggestions that will all cost some money but should end up with links embedded in content on relevant sites. The key is to be creative.
-Run a contest within your industry with a good prize
-Hire a good writer to create a free ebook for your typical consumer
-Hire a photographer to take industry photos then provide them as free stock photos under common creative license