Dont change the case.
If you want the silverstone then get it, it will be one of the parts that will last and last.
It comes with a single fan, not lots.
If he was running a 5.0+GHz death-or-glory overclock on an i5-2500K with overclocked dual 6950s and the motherboard was looking like it was going to have a meltdown, I'd agree with you. The dude's running an i3-2100, it's total overkill beyond belief. It'll barely rise above room temperature if he keeps it in a box without holes in it.