Good suggestions all around - I am with rstofer: the SDS1104X-E would be my choice if I were looking for a new scope.
Despite it is not entirely mature as the DS1054Z, it is a more modern architecture that has more horsepower and therefore more "room to breath" - i.e., if Siglent keeps a consistent trend of improving the features and usability, it will be a much better equipment when it reaches maturity. I understand this is a bit of a gamble, but they have been providing support for older platforms for a few years now and, due to its cost, the SDS1104X-E is probably selling well to warrant the same long term support.
I wouldn't be too caught up on the used prices, as they vary greatly. The price you mentioned for the DS1052E is too high in my opinion.
The one huge compromise the DS1054Z has is during serial stream decoding: it only decodes what is on the screen, which is very limiting in my opinion but others will certainly differ.