From what I know of these discs (and I'm throwing about 50'-75' short of you):
currently I have : 1st run boss (pure D) - it's overstable. If you finish hard right, you're probably a little nose up or just not enough snap and disc speed to get it to do what it should.
Z avenger (overstable D) - This is a long disc, but it's not as long as the wraith, valk or boss. I would consider this more like a longer teebird. Possibly not necessary unless you have some specific uses.
beat wraith straight - what plastic? I find that the champs work well for me. Star might work well for you. Something in the 165-170g range to hyzer flip or 170g+ to release with only a touch of hyzer or flat. This is probably the most reliable distance driver. The problem some folks have is they are unable to control it consistently.
star valkyrie (very beat, hyzer flips/anny) - this sounds like a special use disc. You could keep it in the bag and use it for rollers, or whatever. Just not your go-to distance driver.
With your distance, I would imagine you could use the same disc for hyzer flip and predictable fade distance. Just have the predictable fade disc be 7-10g heavier than the hyzer flip disc. If you like wraiths, give it a shot. I believe you have enough arm to utilize that disc properly. You could go for any of the high speed discs - just depends on which one does it for you. Lots of folks like the destroyer as well. It's a tad more overstable than the wraith. Then they have an x-caliber for same shot with a bit of a headwind. The destroyer could also be thrown in lower weight pro for hyzer flip and heavier star for overstable.
Good luck. have fun