A ranking from my limited experience:
Easy (all require knowledge of chords, each has some very large chords)
Op 28 nos 4, 7, 20
Not quite as easy:
Largo in Eb Major
Op 28 no. 6 (requires left hand arpeggios, some repetition of notes with the RH's weaker fingers)
Intermediate Easy:
Waltz in a, opus posth. (requires controlled arpeggios, grace notes, some jumps, and general fluid playing and good phrasing)
Fugue (requires some independence of hands, ability to play multiple lines, and ability to trill)
Harder Easy:
Op 28. no 2. (requires the playing of legato double notes in the left hand, often with considerable stretches, could be in an easier category depending on your hand size and left hand ability)
Op. 17 no 4, mazurka. (requires cantabile playing, ability to do rapid but light ornamental flourishes, some very simple chromatic fingering)
In the next tier are some of the waltzes, more characteristic mazurkas, and the hexameron variation.
At the beginner level, though, you really want to look at other composers' works. The easiest Chopin works are pretty much all slow, lyrical works with chords. At your level, you need to diversify. You should really pick up a beginner piano book (or few), which will expose you to a lot more techniques that you will need. You're going to need to be able to play arpeggios in both hands, melodies and counterpoint with your left, so looking to simpler music will enable you to learn those kinds of things without forcing you into the deep end (which can also lead to you having bad playing habits).