525d vs 530d

Hi all,

I'm in the process of buying a new 5 series....I'm torn between the 525d and 530d (sport models)

There's a difference of €5,000 between the 2 cars.....do you think there is a big difference between the 525 and 530.....is it worth an extra 5k??

Also.....did anyone ever hear the logic 7 hi-fi system in the new 5 series, I'm thinking about getting it but I've never heard it.