you're spending a lot on the case considering the budget. Something around $50 seems more reasonable. Saw this one for $40, it's a little taller than the one you listed but the other dimensions are about the same.
Also, if you live near a microcenter, they have the AMD FX 6100 for $110 or FX 8120 for $140 plus $40 off a motherboard when purchased together. I know you said you wanted to keep the CPU, but it seems like a good deal to me.