I am ordering a 2013 X5 50i M-Sport. Some questions

[Doms X5 48is]

Hey guys. I finally sold my old 4.6is through a private sale and got 15K for it. I am going to use that money to order this custom build:

2013 X5 50i M-Sport
Black Sapphire
Black Nevada Leather Interior
Dark Burl Walnut
M-Sport Package 4700.00
20" 333M Wheel Upgrade 950.00
Premium Audio Package 950.00
Bmw Apps 250.00
Destination Handling 895.00
Total MSRP As Built 71,945.00

1.) Question 1. Is there anything else you guys recommend option wise that if you had to do it once do it right?

2.) I am very interested in the M Performance Package or the Dinan Stage 2 Reprogram. Is it worth the 1600 dollars for the M Performance Pack for only 40hp gain from stock?

3.) Can I order the Dinan Stage 2 direct in my initial build from BMW or do I have to order the car, take delivery, than install the dinan stage 2 a few weeks later?

4.) What is the horsepower increase with the Dinan Stage 2 tune?

Thanks in advance guys!

Dom

PS: here are some exact pictures of the build: