Hacked is an incorrect word in most cases for Minecraft servers. Usually it is poor management of resources or trust. For future reference, give more info about the situation.
The best headphones I've had for $100 is the Corsair VOID 7.1 surround Stereo headset. They are very comfortable for long-term usage. the mic quality has been described as if I'm right next to people, and the audio quality is very... delicious. Best tech purchase of mine besides my giant screen.
If you've got the money, the Corsair VOID headset is pretty awesome. They're good quality too cuz I use them. $99 for wired, $129 for wireless, and $149 for the Yellowjacket edition
8gb is fine for a lot of things but if you plan on heavily modding games, getting more than 8 would work out. If not, 8gb is plenty for several things to be happening all at once if they are not all too demanding.