Any advice on a 458 SOCOM upper?

[DrHenley]

Trying to build an accurate 458 SOCOM. This will eventually be suppressed shooting subsonic loads for hunting Pigs at night, and supersonic loads for deer.

I got an inexpensive (not cheap) Aero Precision lower, now I'm looking for a good quality upper. Reviews on all the inexpensive ones have made me think I need to spend about twice as much as planned to get a good one.

Right now the two most viable options are Rock River and Tromix. Building my own with high quality parts seems to be more expensive than buying a Rock River upper. From reviews it seems Aero used to make a great 458 SOCOM upper that wasn't too expensive, but they no longer make them.