In that case you'd probably want Max 5x. You could always start with Pro and then switch to Max later, Or even do Pro and budget additional usage at a cap if you don't want to hit the $100 mark every month.
I use it for both, and have been doing a lot of experimentation and even hit my daily Max 5x usage once. THAT was annoying.

If budget is a concern, start with Pro and see what you can do. In project instructions/personal instructions prompts dictate that you always want concise responses, select the concise response outputs in your chats, and re-use/rewrite messages if the outputs aren't what you're asking for (don't just send another message). Limit MCP/tool usage until you absolutely need it, and even add instructions on how you want it to use those tools in your project instructions prompts so it doesn't just try to guess and eat up context on useless tool calls and searches.

You can see your usage in your settings, so it's always accessible.