I would like a headphone that is comfrtable and will last for years 3-4 years

Am going to buy Objective2 Headphone Amplifier and Standalone ODAC and Beyerdynamic premium 600ohms. What is the difference 250ohms or 600ohms for movies and playing pc games and watching youtube videos.   Beyerdynamic 990 600hms $340 Beyerdynamic 990 250 ohms $300 $40 extra for 600ohms is...

Bump

My budget $600 on amp and DAC and $150-$300 headphone I have never used a Dac or a amplifier or a high end headphone.The purpose is for watching movies, play pc games and watch youtube videos. Should i buy Vali amp or Magni amp what's the difference? Dac - This product is from schiit website...

My main purpose is to watch movies,watch youtube, play pc games. Reccomend me better headphones at these price ranges $100-180 Am new to this never bought amp or dac so please explain as simple. Audio Technica ATH-M50x $169 http://ecx.images-amazon.com/images/I/81iNv2DDnWL._SL1500_.jpg...