Advice on gear for wildlife photography

Hi, I'm going on a safari soon and plan to use it as an excuse to get back into wildlife photography after a brief flirtation a few years ago. I previously used Nikon gear but no longer have my camera body, so am looking at buying a new lens and body combo for the purpose. I have my eye on the sigma 150-600mm lens, but was looking for some advice on bodies to pair with it. I want to hit the sweet spot of low cost whilst making sure that the body is good enough not to be limiting the performance of the lens. Any advice appreciated!