What Mac should I get and where should I buy it from?

Hello! I’m hoping to acquire a Mac for my birthday this year. I have a few questions about everything and I was wondering if anyone would be able to help me out.

First off, what Mac should I get? I plan on using it mainly for editing on Da Vinci resolve, as well as your usual computer-y stuff. Writing, watching shows and movies, etc. Nothing huge, no blender or 3D animation, I honestly won’t even be in the fusion page much. Just editing and color grading. Right now I’m using my mom’s which is a MacBook Air 13. It works really well for me at the moment, should I just get one of those? Or should I get a pro? Is it really worth the extra $500-$1000? I plan on using this for the rest of high school, so I want it to be reliable.

Secondly, where would you recommend I get it from? Should I get in refurbished or brand new? Amazon? Best Buy? Apple? Walmart?

Thank you so much to anyone who can help me out!