If you're looking for a notebook that's made specifically for this kind of thing, I'd check out the Action Method series from Creative's Outfitter. They all use high-quality materials, and many of them have task lists built in:

http://www.creativesoutfitter.com/products/100/action-method

But if you just want a blank notebook, I've never found anything I like better than the Dot Grid Book. It's amazing:

http://www.creativesoutfitter.com/product/34/dot-grid-book