Thanks for everyone's comments, I think I can see a Ruger57 in my future.
Academy had one in central Texas yesterday. $749 IIRC.
Paul Harrell did a side be side review against the FN.
Thanks for including the link to the side be side review, very helpful. I've also found some reviewers, for whatever reason have bias, this guy seemed pretty straight forward. I was suprised that he thought the trigger was horrible, abysmal ect. and it was also interesting that the FN had a considerable break-in period and after several years still isn't completely reliable while the Ruger has no break-in period and in the several hundreds of rounds he's run through it, zero malfunctions.
As to ammo, I'm not very concerned as I've still got ~ 2K from my PS90, and I also have a AR57 with a full-auto bolt that my M16 seems to like, but I still don't seem to shoot it all that much. At any rate I've saved all my brass and bought reloading dies and a shell plate for my Dillon 550B years ago ... although I haven't reloaded anything yet, I think I'm covered.
One thing I didn't hear is if the barrel on the Ruger57 is threaded ... Several years ago I bought a YHM 22 suppressor which is full auto rated and makes my AR57 hearing safe.
My AR57 started life with a 16" barrel but I had it cut back to 8" and re-threaded so my suppressor only extends from the one piece upper about 1.5" or if I want, I can just use a 5.5" barrel extension and I don't have to shoot it suppressed. These eject out the bottom just like the PS90 and I've cut the top off an old magazine to use as a brass catcher.