They should give you the base option and then a list of upgrades with prices (study tech did so I am assuming remtek is the same). From what you have said, you are going to want probably a higher amount of ram 16GB and atleast 512GB SSD. You do not need to worry about graphics if you aren't doing any gaming or benchmark heavy processes. In terms of a processor try to go for AMD 5 or intel i5 or higher, and the newer the better.
Edit: Regarding the Mac, a lot of the assistive software (I am looking at you dragon) do not work on mac, so it might be worth giving it a quick google, you don't want to be upgrading to a mac and then your much needed software not working, you will adjust to windows regardless just takes some getting used to.