I liked the power! I'd recommend Vox as well its a feminist novel.
time travellers wife is excellent but has really sad bits. Her fearful symmetry is also a good read.
Have you read Sarah Waters books at all? I find her engaging without being too taxing. I like the little stranger best... from what I remember tipping the velvet and fingersmith have a fair bit of smut.
If you like dystopian stuff Lockdown is one of the best I've ever read, it depends if you find that taxing.