Joe,
Funny that you mention CMS sites. I am actually in the process to create my own platform based on an open source CMS. The great potential here would be to create a platform that allows me to create content seperate from lead creation ( e.g. create content that you can combine with a form that makes sense for that content) Now we have to create a content page and then link it to a standard form page. This means you lose visitors with the extra click. I want to create a platform that allows a dealer to place different pieces of content on one page. Give me about 3 months and I will be done. Have the layout and basic design done, just need to put all the pieces together (new inventory feed, used inventory feed, flexible forms, etc)
These vendors get to set in telling dealers how it should be done eventhough they all used to work at a dealer themselves and most have no clue.
Regarding the pop up and pop under. Call dealeron (dot) com and tell them that you want to try this tool. It definately increased my conversion ratio ( I had dealeron place this tool for free on my dealerskins site which gave me an increase of 1-2% conversion, which equated to about 50-100 leads)
With dealerskins I converted about 5-6%, now with dealeron site I am converting 9-12% and with dealerskins it included service appointments and with dealeron it does not, so the difference is even bigger.
I will keep working on this open and flexible platform for dealers so you can change themes with the click of a button, add content with the click of a button, seo friendly, etc...