Esme, I use Mara and call it Gutermann and I order from them proper or Wawak, and only if I can't wait for it from CTSUsa. I rarely walk into a B&M store for much, all of my actual sewing supplies except for patterns and very occasionally fabric comes from online stores. Being in Tennessee, you are also aware how much isn't here...I live at the Al/Tn border, and I can drive 45 min to Florence or 2 hours to Murfreesboro (or 3 to Nashville) for supplies and in the end, they have a 10th of what I want, so I stick to online.
Most of my thread comes from CTSUsa on that end, if Coates would have approved my wholesale application, I'd probably use them but their retail plastic spool sucks on all my machines even with the setup so I don't use it. But most of my thread is industrial spools and most people have no need for it, so I never recommend it to anyone. Basting thread I use Torre from Bias Bespoke.
On the perfectionist end, I am one. My clothes may be ugly (see weird zebra pants from hell with ribbon fringe on here) but they were certainly sewn well. Perfectionism is a weird quality...you may find being one miserable, but I find leaving errors to be a nightmare. No, I don't always achieve perfect, but I come as close as I am able.