Being a Performance Center gun, does'nt that put you into Open class? If so, I'd go for the optics. Moon clips are the way to fly, but buy lots of them, the 8 shot ones bend and break easily, usually as your loading on the run and you or the range officer steps on them or kicks them. I use .38 short colt brass in My 627PC, with 130 grn FMJ'S, the moon clip grabs them very well, no wiggle.
Nice purchase, I'm looking for a TRR8.