i need a very good looking case something like a raidmax agusta my budget is 150$
By "good looking" do you mean something out of sci-fi films or something elegant? Just go to Newegg, look at some cases and decide what you want yourself.
Personally I'm a fan of the Fractal Design's Define series.
ya the define with the windowed side panel is the best
This case looks really nice and has good airflow http://www.newegg.com/Product/Product.aspx?Item=N82E16811146068
take a look at the corsair graphite series.
http://www.youtube.com/watch?v=iFUO_RwTDg8
NZXT Phantom 810/820? 820 Is probably too expensive but you never know.
http://www.legitreviews.com/images/reviews/2057/threecolors.jpg
Yeah, those Phantoms are pretty cool! Bit'o style but not over the top, imho...