Cartridge for RB300 other things


i just purchased a used planar 3 w/rb300 arm(no mods) and would like some opinions about a suitable mm
cartridge (300-500 $'s). i currrently have an ortophon om30 and it's ok (a bit bright). also i'd like to replace the felt mat with either a ring-mat or audioquest sorbogel mat-what are the merits if any with either one of these and how can i adjust the vta for the mat & or cartridge. also if some one could pass along any other tweaks
that would improve this tt-thanks
vellum

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