I'm doing pretty good with BTT this month!
1) i do like complicated plots and twisty tales. I don't like confusing ones though, which i think is basically a complicated plot with a poor author in charge of it. Complicated, well done, is great. George R.R. Martin's Song of Ice and Fire series is complicated and i love it. if the next book ever comes out i don't think i'll have a problem getting right back into it.
2) A few that i thought of that i enjoyed that have an unexpected ending.
Ender's Game has a pretty big twist but i wouldn't say overall it's a twisty or complicated book.
The Lies of Locke Lamora has the advantage of being a caper novel. It is only mildly twisty but then "the plan comes together" and the reader gets a few great surprises at the end.
American Gods isn't exactly complicated but i think it has a nice twist.
lastly, got a little money you want to donate to Haiti? want to maybe get rewarded for it? The Harry Potter Alliance is basically having a raffle for items donated by various authors, actors and fans, including a signed boxed set of the HP books signed by JK Rowling, a copy of Harlequin Valentine signed by Neil Gaiman, a signed a set of first editions by John Green, and gobs of other fun things. Go here through Jan 30!