Akunthita has a nice review of Si-Dan Toys items on The Brick Blogger. Really gives you a good sense of several Si-Dan items and where you can find them.
There's also a focus article on the samurai helmet which would go well with your Series 3 Samurai or Ninjago minifigures.
You can see the articles at The Brick Blogger. You can also pick up some of these items at FireStar Toys, along with a wide selection of custom minifig accessories from other custom houses.
