Am not of the persuasion that pieces must be studied in certain orders and pre-requisites for others, that is, just find what you like, give it a read and play for a few weeks, if you progress, then it's probably in you to finish it to a respectable level, if not, put it away for now and move on to something else.That said, it would be worth you while to explore (as was excellently advised to you above by previous reply) to look to some of the often overlooked masters. I would throw Henselt into the mix, actually I very much like his etude output way more than the likes of Chopin and Liszt, by a long shot.also I tend to like the work of some of Liszt's pupils more than than of their teacher, like Joseffy (also studied with Moscheles, Tausig ), if you are after a 'concert etude' try something like this (if you still have a desire to keep a Chopin flavor in it)