Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Others may disagree with me, but the best of those three would be the PC-7B, which I have. The big advantage that this case has over the others is front and rear 120mm fans, for excellent cooling and great potential for a silent computer. The PC-65B has a front 120mm fan, but the rear and top fans are only 80mm, and the PC-61 USB has only 80mm fans throughout, with two in front, one in the rear, and one up top. 80mm fans can't move as much air as a 120mm fan (or at least, they can't do it as quietly) so if you want good cooling without a buttload of noise, the PC-7B is your best bet.
The reason the PC7B is cheaper than the other two is because it doesn't have a removable motherboard tray, which the other two do. There's plenty of room in the case so I don't think it's really necessary, but if it's a dealbreaker for you, you should look elsewhere.