I owned a PX-160 for the first year I was learning piano, and the only reason I don't still have it is that I gave it to my sister when I upgraded to a Kawai CA99. The Privia PX-160 is an instrument that's fairly comparable to the P-45 -- it's a solid entry level digital piano. It sold for $500 new for most of its lifetime (it went up to $550 as they were phasing it out.) $300 for it isn't a bad price at all. Unless you're just more comfortable buying new, I would choose a $300 PX-160 over a $550 P-45. The P-125 would be a small step up from the PX-160 or the P-45 -- if I already owned a PX-160, I would not consider a P-125 a worthwhile upgrade, but for someone that's looking to buy one or the other, it really comes down to whether you're willing to spend the extra money for a slight increase in quality. There's no objective right or wrong answer to that one -- if you like the P-125 better, you might consider it worth the extra money. Alternately, you may not notice much of a difference between them, in which case it probably isn't worth the extra money to you. Answer from Tyrnis on reddit.com