Hello! I'd like to add my $0.02. I would highly recommend the 10 Microns. I have a GM2000 which has been exceptionally reliable and bulletproof. All models have spring loaded gears and their own proprietary absolute encoders, which lets me take 10-15 minute subs at 2.4m focal length unguided (in this case with a Meade 12" f/8 and QHY268C).
Testar has the GM1000 in stock which will be more than enough for your needs -
https://www.testar.com.au/products/10micron-gm1000-hps.
I've seen people run CDK 12.5's on these with no trouble!
Edit: It's worth noting that these mounts also have zero backlash.