Flow Chart web control?

Guys, I'm going to need flow chart for one of our ASP.NET application - I found two vendors:

1. Dundas
Interactive demo: http://demos2.dundas.com/diagramdemo...chartdemo.aspx
Feature list: http://www.dundas.com/products/diagr...aturesList.htm
Cost: TO BE CONFIRMED, but my guess is, probably roughly US$2-3k

2. Northwoods Go Diagrams
Samples: http://www.nwoods.com/go/dotnetsamples.htm
Pricing: http://www.nwoods.com/go/ordering.htm
Cost: Probably around USD$2000 for GoDiagram WebForm edition

3. Mind Fusion

Online demo: http://www.mind-fusion.com/NetDemo/net-demo.htm
Feature list: http://www.mindfusion.org/features-net.html
Cost: ~USD$500

Just wondering, anything from Source Forge? Any suggestion is welcome. Thanks