I started playing nidalee a little while ago going off of navyxv's build Mid PWNAGE located at the top of the list at the right of your screen. And shes quickly becoming my favorite champ, I still play somewhat by his/her guide, i just changed the items. masteries, and runes, to the ones I use and work very well for me.

The way I play nidalee is more of a support, so i decided to maximize her ap. Making her javelins to ridiculous damage at long range, and making her drop some fat *** heals, usually pushing around 900 hp.

And between deathfire grasp, and lich bane, she still has very impressive burst damage.

I like ROA and Ryjai's, because they both give very, very, nice health, and the slow from ryjais is great for when my teams chasing down the last couple enemies.