I'm looking for pieces that would be on the hard side for Grade 7, or easy Grade 8. There seems to be such a huge jump to get from one to the other! So far, although I haven't done exams, I've been using the Grades as a guide for what to try next, but I don't think I can just dive into Grade 8 even though I'm very happy with all the Grade 7 pieces I've tried. I gather the Chopin Nocturne on the current Grade 8 syllabus could be do-able, but anything else? Maybe from previous syllabuses or in Grade anthology books?
Also, on the other hand, I'm looking for nice anthologies of easier material so that when I want to play the piano but don't have enough energy for something hard, I can have something to semi-sight read / learn in a short space of time. I am almost finished with Burgmuller's Op. 100, and I had a lovely time a while back with some easy Kabalevsky that I found in a charity shop - so anything like that, probably around Grade 3ish to 5ish would work well.