|I do not know for sure that your MB is a standard ATX type or not, but there are other considerations that probably will make your case obsolete as well as your MB, CPU, RAM, Power supply, and more.|
If you are thinking about a new build, do it right and get everything you will need to fit your needs and your budget. There is no upgrade path from what you have and the case probably does not have the cooling capabilities, the space for modern video cards (for gaming, video editing, Photoshop, etc), possibly not even a standard power supply, etc. You can get a fairly nice case for under $50. (US) and a decent one for close to or a little over $25., just do NOT choose any that come with a power supply (always junk).
If you cannot afford to do it right, look into used/refurbished computers from a reputable source, just make sure that it comes with a decent warranty and if possible, demonstrated for you.
Post the specs of what you are looking at, a list of components if building, plus your general uses and your budget for our opinions on your choices before you purchase.
You have to be a little bit crazy to keep you from going insane.