The pick of the bunch, my seriously, just go and READ THIS pick is the Magnificent Devices series by Shelley Adina (steampunk). I nearly gave up on the first one because I thought it was going to be Georgette Heyer like romance with a "spirited heroine" in a steampunk setting, but I'm so glad I persisted. The narrative takes a couple of really unexpected twists, and it is just so incredibly enjoyable and creative and awesome and gleefully fun. Both of us are reading the series right now, and enjoying every minute. The fifth book is coming out soon, and all four in one volume are currently under a dollar, so it's an awfully good time to give it a whirl for small change.
Coming close is the start to a very different series, The Sekhmet Bed by Lavender Ironsides (Yeah. I know. Don't judge it by the pseud) (historical fantasy). I should say that the author is horrified by it being called YA, but it's my list, and I consider it YA, so there. It's the story of the adolescence of Hatshupset's mother, of all the fabulous characters, and it's a mix of coming of age in Ancient Egypt, powerplay and intrigue between the protagonist and her ambitious, sexy sister, and fantasy built around Egyptian mythology. It's brilliant. Waiting eagerly on the sequel, which will be about Hapshutset her/himself.
Less well written, but definitely super fun is the Causal Enchantments series by K. A Tucker (vampires). They are vampire teen novels, clearly Anne Rice inspired, with an alternate universe and a war between witches and vampires. The storytelling is great (better than the technique, to be honest) and they are addictively easy to rip through, with the special fun of predicting what is going to happen next, omg. Also there are huge psychic, surprisingly cuddly hell hound things. They also have the most stupid heroine I've ever met, Evangeline. This may be a drawback for you, but Izzy and I found it a feature not a bug. Evangeline is hilariously dense. She's great. The first book is free, and we went and bought all the others.
daynight by Megan Thomason (dystopian) has brilliant and fascinating world-building, so much so that I swallowed it in a gulp. It has all the expected ingredients, such as a love triangle and "we must pretend to be in a relationship omg" (actually, that's one of my ironcast tropes, I love it), but it really has a different world than any dystopian I've read. (There's a prequel, cleanslatecomplex, but I wouldn't suggest reading it first.) I have one major caveat, a recurring problem in selfpubbed YA, in that the heroine's emotions seem WAY off. She experiences the most startling or horrendous things and they don't seem to phase her in the slightest, she's straight back to "Hi, hot boy!" or dozing off. If you can cope with her bizarrely flat emotions, however, this is fantastic. Another one where I want the sequel NOW.
I have more recommendations, but this will do for a start. :)