This I would look out for is pixel size and cooling. The KAF8300 or similar sized sensor works well with most refractors. Good cooling is a must in opinion. Being able to hold around -20C is fairly essential.
As for your mount; well no guiding means elongated stars. There are only a couple of mounts on the market that can work unguided and produce round stars at 5 minutes; all the rest need guiding. That would be the first thing I would fix. I cannot see how you are going to use the mount for AP unless you hand guide it yourself.
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