I don't own an E70, but have driven them.

The 35i (turbo 3.0 litre) came out as a 2011 model.
The 30i has more power than your 3.0, but as the E70 weighs more, I agree with chiefneil, you won't feel it.

It is nice to have the openness of the panoramic roof. Downside is it fails more often, probably due to the more complex mechanism.

3rd row seat is OK for small kids. If you really need a usefull 3rd row, get a minivan, the access is much better. I wouldn't order the 3rd row myself.

There are lots of new electronic aids and toys. While those can be nice, they are also things to fail, and can cost $$ to fix. Consider if you need them before looking for a vehicle that has all of them.

My driving comparison is that the E53 handled nicely, and suited my needs. It was as large a vehicle as I wanted. The E70 got larger, heavier, and less nimble. I would rather have had a new E53 than an E70. We therefore decided to go the other direction, and bought a new 2007 X3. It has the higher power engine of the E70, but weighs much less, so performance and mileage is much improved. It also handles much better. The flip side is that it doesn't have as much room or as many options, or tow as much. Since I don't tow more than the 3500 lbs it is rated for, and there are often only two of us in the vehicle, it works for us better than the E70.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue