re: WW
Quints are basially a tossup. I like ArPen, but I spec differently than most. MS, AS, Armor, AD, G/10, Xp all probably are fine.
W > E. You can take a 2nd or 3rd point early in E if you like, but the AS increase and CD decrease on extra levels of W should not be overlooked.
I personally run 21/0/9. I don't think the defensive tree offers too much to WW and I like having the % pens for lategame and the other Offensive masteries for faster jungle clears. This is non standard though, most jerks run 0/21/9 on him. I mean, hell, I run 21/0/9 on Rammus, so this is probably just something about my playstyle.
Phage -> Mallet or Triforce is an excellent way to finish builds on WW, but typically you're set for midgame with wriggle's + wit's and at that point you just add Frozen Heart, Aegis, Spirit Visage, w/e to pad your defense, though a lot of top end WWs have just been rushing their Mallet post wit's for HP and the inescapability.