eGPUs are more advantageous for laptops. The iMac's internal GPU is pretty capable for games. If you want to push the graphics beyond that, you're probably gonna want to run Windows on it to receive full support*, in which case all the eGPU rules are different, or better yet build a gaming PC w/ Nvidia GPU.If you have to buy an external monitor to use the eGPU, I kind of don't see the point. You may as well just build a gaming pc.
* Feral does a great job with Mac support, others not so great, mainly due to the graphics APIs/drivers wars
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