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.
Probably the Terratec Aureon 7.1 Space or the Terratec DMX 6fire 24/96. Are you talking about the card with the best analog output and includes an optical output, or are you asking which card's optical output is best? If you are asking the latter, the differences from card to card are very small and dependent on what kind of source material is used.