I often recommend Mistral-Nemo-Instruct I think that one strikes a good balance. But be careful with it, it's not censored. So given the right prompt, it might yell at people, talk about reproductive organs etc. All in all it's a job that takes some effort. You need a good model, come up with a good prompt. Maybe also give it a persona. And the entire framework to feed in the content, make decisions what to respond to. And if you want to do it right, and additional framework for safety and monitoring. I think that's the usual things for an AI bot.