As far as I know, homes are either built with mello roos attached or they aren't. Your realtor will know and you can specifically say that you don't want to see anything that has mello roos if you don't want that. Some people don't mind mello roos because it covers better schools, parks, etc. in a particular area. I wouldn't expect mello roos fees to go away completely. Any communities that are recently built in what was previously open land has a high chance of mello roos. It's rare for older communities to have them. If you love the home and it has mello roos, it may be easier to just think of that as part of the cost of the home and not additional taxes. Or, you can bypass all of that by telling your realtor not to show you anything that has mello roos, or association fees above a particular amount. The areas that you mentioned most likely have at least association fees.
Good advice - thanks! Will just have to see what the complete picture/cost is.