Congratulations on your purchase as well! Your color is known as Magnetic Gray Metallic aka MGM.
A few of us have HIDs on here, but I wouldn't recommend it because our headlight housings are designed for halogen bulbs, and you'll get alot of glare and not a straight cut-off for those.
I personally wouldn't tint the headlights since it would reduce your light output and since you already have the S model with black housing, why tint it? The tails are fine, but not a black out tint.
Many of us here have aftermarket intakes, Short Ram or Cold Air, its pretty much each to their own, There are plenty of discussion threads if you just search for 'em
If your afraid of lowering it too much, go with TRD springs, it has a subtle drop to it, levels the car out, and the way it makes the car looks, it looks like how it should of came factory due to the '4x4' stance the Corolla's come stock with.
Making it show worthy, I think a good drop and some nice wheels will definitely set it off. Stance just gives that wow factor!
Hope ya find everything ya need, just search around!