Reply to Keyboard for Production

So I am slowly moving into production as I have many ideas for song beats in my head. I am looking for beginner midi keyboards, but don't know much about them.

I know that i want at 25 key or 49 key keyboard, but nothing bigger. I also have a budget of $400. Any suggestions or advice would be great!

I also have a AKAI APC40 and a AKAI EIE IO PRO