A R9 290 should pretty well dominate everything out there ATM and the Tri-X is a particularly good card, in tests it's VERY close to a stock R9 290X in performance and very quiet in operation.
Just be aware that like all cards of this type it needs good case ventilation to run at its best, good intakes fan/s are a must.
The FX8350 and PSU are plenty good enough.