You might be able to save the tower
If you get a compatible mobo, you might be able to save the tower, but I'd sure want to put in a new power supply. The reason I say MIGHT be able to save it is that sometimes manufacturers use towers customized so that some other mobos won't fit. I ran into that with a Gateway desktop once. Bare towers aren't that expensive, I think I paid $40 for one a couple of years ago, so it's not too expensive if you have to buy one.