Welcome aboard! Nice stable of cars you got there I especially love the e36 M3.
The new twin turbo 3 series will be nice for sure but the next M3 is gonna be an absolute beast the likes of which have never been seen in the 3-series family.
If you can swing the price and endure the wait, I say choose it over the 335i by all means!!
P.S. the "330ci twin turbo" is otherwise known as the "335i coupe"