I think that you're right on track with posting in forums. Post, and link to the survey in your signature. This lets you really target your demographic without having to spend a lot of advertising dollars. Not only that, but you can usually find lots of community members who are willing to help you, especially if you post a lot, and they get to know you.
cscgal
The Queen of DaniWeb
19,421 posts since Feb 2002
Reputation Points: 1,474
Solved Threads: 229