first base is a very solid for a beginner, finding something that won’t break quickly and is actually quality under 20 can be hard. the lowest I can think of is the replay pro, I believe some of those come stock w a responsive bearing, you just have to be mindful of which one you buy. but, if you think he would stick with it, which hopefully he will, I would go for the first base
a lot of people like the Recess First Base, I believe it comes with both half spec and full width C bearings. I like the YYF One for responsive play. I think the Whip is a touch too unstable for a beginner (I always say how much better the Whip became after I had just a little bit of skill).
the responsive replay is a good idea, I have an unresponsive and I enjoy it a lot.