A huge amount of Philo is wasted on Shyvana, though. Mana regen all over the place and she doesn't even use CDR for her ult. (Fun fact though: if you do buy it and want to sell it, upgrade it to Miracle first and the sale price increase is more than the building cost.)
Kage's is definitely a choice though because Twin Shadows is a pretty amazing ganking item and has late-game utility as well.
Sightstone is by far the best way to end up with more gold at a given point in the game, though. HoG was only 30 GP per minute while Sightstone saves you 75 gold per ward and gives half the HP HoG did to boot.
"That is why war is so tragic. To win means to make victims of your opponents and give birth to hatred." - Kratos Aurion, Tales of Symphonia
I don't take Sightstone on my Supports anymore. I hated the idea when it was announced, and I still hate it now that I've tried it. It completely destroys your vision of the map, because you can only put out two wards. However, if you just buy the wards, you can throw down as many as you can buy at once, which is really good for late game. Keep the ward on dragon, plus the 3 you need for baron, rather than having to choose. Take the jungler item or Kage's if you REALLY struggle to keep up in gold like I sometimes do when I can't land a good gank or two. Honestly on Shyv if you're building tank take the spirit of the Ancient Golem.
Violence is never the answer. Because the answer is always Vlad. LoL IGN: I Rock Ths