4.8 to x5m?

[x5 4.8i]

I have a fully loaded 08 x5 4.8 space grey, dark bamboo trim, and black nevada leather. I love everything about this car, but there can be some improvements like the idrive.

I've been reading forums about the X5M and x6M and I thought about switching to an M.

The problem is i have a 3 year lease on my 4.8 and in january its going to be one year.

So, do you think the dealers will allow me to switch to an M. & if you were me would you switch to an M?

Melbourne Red/ Black Leather/ Carbon Leather/ fully loaded
Black Sapphire/Sahkir Orange Leather/Piano Black Trim/ fully loaded
both without the rails

which combo would you choose?