Welcome ulsankai from little old Tasmania...
Shambles is a bit biased towards the black
As far as tyre sizes go ..over here in Aus the 15" wheels get a very basic tyre whereas the 16" tyres are slightly wider and lower profile (so a bit better but only average)
We've had few if any complaints about the even lower profile (and slightly wider again tyres on the the 17 inch alloys) so they must be fairly good..
The 16" and 17" alloys obviously look dressier and fill the guards better...
At the speeds the i30 would mainly be traveling the bodykit and spoiler are really only cosmetic...
There appears to two 2 "i-blue" options (not available in Australia yet as far as I am aware) One uses stop-start engine technology and the other has different gearing (both apparently are to save fuel and omissions - I personally feel the stop start technology has the most merit)
I'll let someone else answer the freebies question although I would go for the genuine mats and an i-pod cable for starters..