I don't get how all these young'uns can afford these cars. The insurance must be absolutely mental for a car like that at 19, especially with mods, then there's the fuel. When I was 19 I had the occasional use of my mums Fiat Uno and a Skateboard for all other times (still use the skateboard).
Anyway, rant over. I started a thread just the other day asking about csl reps for the E90. I tried to disguise it as a question about offsets but I was quickly found out. They can be bought for a little under £1k with good tyres and there's no need for spacers to achieve the wide stance in the pictures. I would say that it's probably worth your while just getting an m sport as surely the extra insurance and initial cost must be less than modifying and insuring a modified es/se unless you are not declaring these modifications.
Final point. Ski is spelt sky unless you actually meant the winter sport.