There is no right or wrong choice with the brake discs providing they are properly cantered, I was fortunate that aluminium spigot rings from eBay centred the discs with only a modification with a flap wheel. Once you get to around 275mm rear discs you no longer need to use countersunk bolts for mounting the callipers, just use Allen bolts. I have already had one SAIC rear brake calliper fail, actually the previous owner did, he fitted them and then took them off, he said he preferred the OE ones, I paid £60 on eBay then immediately bought a NOS one to replace the failed one.
My next experiment is with MX5 rear callipers, the hand brake cables fit without any mods. They are a much more modern design with bigger pads.
Texstar brake pads are part of TMD Friction who make Mintex, Don, Pagid, Bendix as well as supplying oe manufacturers.
EDIT
I am currently in NZ so cannot confirm but you might need the 294mm discs for it to work. I won’t be home for a month.