Dan and I were chatting about this a little, so I wanted to throw in a thought or two. Twilight is a book that we have information on in terms of writing style, so I wanted to throw three books out there for you to try; I'm curious which - if any - you'll like, since they're all recommended for different reasons.

All three are based in some way on your preference for Twilight, though different aspects of Twilight for each.
1. House of Night by P.C. and Kristin Cast:
The first book of House of Night is called Marked, and as I said above, is basically about a young girl that finds out she is a vampire, and goes to a school with other vampires to learn the trade (Vampire Sociology and the like). Over time, she grows in power, grows up, and kicks butt, basically. The writing style of Cast is similar to Twilight, though not exact. Hunted's Pacing and Dialog levels are not exactly like Twilight (lower paced, higher dialog), but many of the other elements overlap.
2. Tattoo by Jennifer Lyne Barnes:
Tattoo is a closer writing style match to Twilight than House of Night. It's about a group of four high school girls (as I understand it) that all gain some sort of special power through their tattoos. Not only are Barnes' writing style metrics similar to Twilight, but the keyword overlap between the two is better than House of Night. If I had to pick one on your list, I'd be curious to hear how you liked this one, but it's really dependent on which storyline you find interesting.
3. Fly on the Wall by E Lockhart:
About a high school girl that wishes she could understand the other people in the school, and gains the ability to see what other people are doing when she's not there. I haven't read the book, but I think she might actually do this by turning into a fly? Not sure.

Again, depends on which story seems interesting to you.
Regardless of which - if any - of these you decide to read, I'd be curious to hear your thoughts on any of them. Hate them or love them, they're very different from each other in some ways, and knowing which connect and which don't would be informative.

Good luck.
Aaron