hello all. I'm currently looking to buy an a4 but don't really know the differences between all the models. I test drove an 143 se a couple of weeks ago which was a nice drive and felt like it had ample power. Although it had a couple of extras including reversing sensors, and an ipod connection, the appearance didn't overly impress me. I've since been looking at the s line range and also the black editions. Ive recently found a white black edition which is a stunning car that I am seriously considering. However is it worth paying the extra cash for a black edition, rather than a s line? Other that the wheels, and black trim, are there any differences? Is 143 bhp enough power, I'm no boy racer any more! I can't seem to find out what are standard extras on the s line. Is sat nav standard on any trim? I definitely would want parking sensors, and a decent sterio system would be a nice extra. Sorry for the novel! Any help/advice would be greatly appreciated. Thanks in advance. Donnie