From what I've heard, the tein SS system doesn't handle very well - it was designed with ride comfort in mind - and you're looking at about $850-900 for the set. I would rather go Koni Yellow ($500) with custom rate ground controls ($300) and have an extra $100 to spend elsewhere.

Tie bars go under the car and strengthen the chasis a bit.

Canards are these triangle looking things that attach to the side of your bumpers to provide frontal downforce.

For the rear sway bar, if you want to save a little money there you can get integra rear LCA's with the JDM ITR oem sway bar, I beleive it is either 21 or 23mm.