I upgraded from an Antec 300 to a Fractal Design Arc Midi last week and the difference is huge. The arc midi has so much more room, it comes with three decent 140mm fans as standard, USB2 & USB3 on the front panel (top actually), it has excellent cable management and comes with a basic fan controller which makes for silent but still effective cooling. I've fitted another 140mm and a 120mm fan and it is still silent even when running Prime.
I did look at the Antec 302, the Corsair Carbide 300R and the Fractal Design Core 3000 but the Arc Midi was the only one that ticked every box I wanted.