Using Umbraco 4.7RC

I want to find a collection of content nodes that have certain conditions, one of them being a check to see if the page is protected. Ideally that would be possible inside a .Where() but at least in 4.7RC it isn't. You can vote for this feature at http://umbraco.codeplex.com/workitem/30096

Until then, I will need to create my own DynamicNodeList with a 'for' loop, checking each item for various conditions. I've tried the following but they don't work.

// get starting list of potential nodes to search
DynamicNodeList nodesToSearch = @Model.DescendantsOrSelf().Where("umbracoNaviHide != true");

// remove nodes that are protected ((this code does NOT work))
DynamicNodeList possibleNodes = new DynamicNodeList();
foreach (DynamicNode node in nodesToSearch) {
    if (!node.IsProtected()) {
        possibleNodes.Add(node);
    }
}

// remove nodes that are protected ((this code does NOT work))
List<DynamicNode> possibleNodes = new List<DynamicNode>();
foreach (DynamicNode node in nodesToSearch) {
    if (!node.IsProtected()) {
        possibleNodes.Add(node);
    }
}

How can I create my own variable that contains the nodes I want for later use?

cheers,
doug.