Check Reverb.com prices.

The P-71 is the same as a P-45 I believe, just an exclusive SKU for Amazon.

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Fact is, speaker quality in all slab DPs, including the more expensive ones, is poor. In budget DPs it is outright miserable. And there are big differences among them (much bigger than among good speakers!). Decent headphones are less expensive than decent speakers. Sure you are welcome connect external speakers if you think they are better, especially if you've already got them and don't mind the extra wire. Another thing you should consider is how the key action feels. I don't like the P/CLP key actions, but this is subjective and you should try yourself. Check also Roland FP-30, Kawai ES110, and also pricier models for reference. More on reddit.com

The Yamaha P45/P71 is still an excellent introductory piano. You can get a whole set with a bench and a stand for ~700. The only competitor at this price range would be the Roland FP-10, but Yamaha is the more popular option. Slightly more expensive is the Yamaha P125 which if you can afford would be a better option. But with the stand and the bench you're looking at spending around +$350 more More on reddit.com

Save up a bit more and try to get the Roland FP-10. It has the best key action in the price range, and a significantly more complex sound engine than the P-45. Much better polyphony too, which helps a lot if you want to do things like using dual tones. More on reddit.com