I currently use a Antec 300, and basically my front 2 usb crapped out. The left one is jiggling all over the place, and the right one just doesnt take in any USBs at all, on top of that my front audio doesn't work. Opening the front panel literally takes decades, just to change position of 2 fans.
As you can see, i'm not that familiar with the cases, i only know mostly antec and corsair. I feel like i got cheaped out from the antec one, so i feel i wanna avoid them. I'm a big fan of just looks, so a side window panel would be cool. I read about the haf, but personally looks a bit too much for me. I'm really open to other brands as well.
The main goal im looking for is something sleek, a midtower with nice clean cable mangement + a window panel.
I definitely looked at the HAF, i simply didnt like the look =\
All of those cases look relatively good, if your going to buy the case in person I would suggest looking at how much room is behind the motherboard tray and it it has plenty of cable ties holders or comes with velcro ties. But that being said I know that the 600T can be good for cable management depending on how much your putting in the case.
If you liked the HAF cases I would go with that since theyre really easy to manage, I'm using a HAF 912 and only see the cables running to back of mobo tray and to graphics card really.