Welcome aboard - great choice of spec
It's always worth asking the dlr to price match, but that is quite a big discount for them to swallow...
Whilst a few people on here have managed to get the dlr close to online prices, it can rather depend on how the dlr is doing towards month end targets, how many extras you order, how much caffine was in their coffee...
Whilst buying online is indeed an option, you may want to consider some
potential downsides - possibly the biggest one of which is that you can't inspect the car prior to delivery, and your local dlr isn't likely to want to fix any issues you may find when it turns up on a low loader or has been driven 200miles to get to you.
Obviously the local dlr will still be happy to service and fix warranty issues, but if (say) it turns up without a reversing camera...
very best of luck, and let us know how you get on!