Welcome to hifiguides,
Falenkor's Competitive Headphone Write Up Wrote this up to help people with the more competitive oriented gamer. Please give it a look. If you prefer more “all rounder” headphones I can recommend those too just know those aren’t as ideal in competitive sense.
Also quick answer to the amps for T50rp. IFI Zen Dac would be nice for a combo unit. Dedicated amp use the $100 units I recommended in that listing guide at the bottom there.