The M550 was very tempting, with a base price of about 74k and change, you could get near super car performance.
Adding on a few options pushes the price well over 84k.
Surprisingly, BMW was extremely easy to deal with. I negotiated 8.5% off sticker and was able to order the color and options I wanted. The most difficult part was waiting 7 weeks on the car to get delivered.
I will say that after owning my last M37s for 7 years, there is no comparison to the 540i in terms of build quality, materials and technology. Hopefully the reliability will be close to that of the Infiniti.