We agree in general terms the threads in DP are a good source for links and DP has a lot of talented, professional & honest members who will not let you down
I've recently signed up for payperpost as well. Bloggers are only required to leave your link up for 30 days so it may or may not be a long term solution. I also like linkworth.com in addition to the other link brokers mentioned earlier. Of course buying direct should be cheaper than going through a broker. So check out these forums and contact webmasters directly.