I work for a company that sells tours and activities (in the tourism industry). They are currently using Dot Net Nuke but they are considering switching over to WordPress. They have a large site with 1000+ pages, so knowing WP is Open Source do you think it is a good idea to switch to WP? The main reason they want to switch to WP is because they think it is more SEO friendly. My main concerns are: WP security, frequency of needed updates, stability of the system, etc.