From the research done, your motherboard will most likely be ATX Form. There's five types, but the ones you will ever need to know are these: micro-ATX and ATX. Micro-ATX is bigger than ATX (obviously). So you're planning on getting another case then you need to get a case which supports ATX Form factor. Most ATX cases support micro-ATX but micro-ATX cases don't support ATX motherboards.
Remember to always look at the size specifications when buying components to fit inside your case.