i do have sports suspension (from the sports package) so do i really need to lower the car?

 

It's all about personal preference so you're happy. Especially with those wheels, because they have not rivets, 18s will give you a great look. Personally, I think 18s are perfect on a B5 and 19s are perfect on a B6. Also, dropping just seals the package. I currently have the sport suspension (eibach sport springs) on my car and the look is great without sacrificing almost any ride quality.