What kind of iMac do I need for my future business?

Starting my own photography business soon and I have my own laptop. It's old but it gets the job done for now but I want to start looking into an iMac as I hear Apple is better when it comes to photography and photo editing and I want my photos to come out great.

So I started to look into iMacs and....yeah.....expensive as hell. Should I just bite the bullet and go for the one pictured above at $1149, or is there a cheaper alternative (like a refurbished iMac) that I can go for? The specs listed in the picture above is where everyone says i need to be computer-wise. Thanks in advance everyone.