What is a good graphic design app for MacOS?

I do not need to do photo editing or anything like that. I need to be able to make graphics for my business' social media, and to display on my in store monitors. I get marketing graphics from different publishers whose products i sell, and i need to be able to add my business name and other info.

I have Photoshop CS5 on my dying windows laptop, and i just got a new MacBook pro to replace my old air. Now that i do not have reliable access to Photoshop i need a Mac alternative.

Does anyone have a suggestion? Cheap would be best. I am willing to pay for a program that does what i need.