Laying out radio buttons and text area in a dialog

I have a dialog where I need to lay out radio buttons and their corresponding text and icons, and a text area. This is my current dialog layout, where the colors denote the icons. Note that the last item doesn't have an icon.

The dialog is to be used in a desktop app. The purpose of it is to type-ify the selected item. I chose radio buttons because drop-down would result in an extra click. The last item clears the type from the item, hence no icon (maybe I should add one?).

Is this the best this kind of widgets can be laid out? Any other options you'd recommend?