I have no pics of an e46 with either kit fitted But I have experience with both kits on other cars.
From experience The Pro-kit will give a small drop, enough to make it look better than OEM but not enough if you want that really low look.
But this kit will make the car MORE comfortable than standard
The sportline kit will give a better lower look and sportier feel while still keeping it high enough to not cause problems getting around.
This will also keep around the same comfort level as the standard set up.
This is based on a SPORT model, I believe the drop id more extreme on an SE and the sport is lower as standard.
On an SE the sport kit could be too low.
Both kits should be around €200
Cheap coils are another option, and much better for that perfect stance but will stiffen the car alot.