Good choice of CPU, and mobos too. (I have a 2600K + AsRock 4 Extreme mobo and it's great so far)
Any mid tower will fit a 4870 Radeon, they are not 10 inches much less anywhere near 14 in) I have a 10.5 inch 570 GTX in mine that has 3/4 inches or so of clearance
I just measured it, yeah it's 9.5 inches. What about my choice of RAM? Would that MB handle it?