All your pieces are OVER PLAYED!!! Learn something new and thrilling!Grab a book of Lecuona and learn a piece from his Andalucia suite... They are all good! And mostly unheard ofMozkowszki- Etincelles is soooo fun to learn..
The Military Polonaise is a bit of a stretch from Op. 18. But if you are developing quickly, by all means, attempt it. The neat part about this polonaise is it's reliance on repetition. Four sections are all you need to learn--or about two pages--of thick but pianistic chordal writing. Good luck! I would also suggest Pathetique. Learn the second movement first. Come back to it later after you have acquired some more specialized technique.