Love the 333i! I've been slowly turning my 4-door weekender into a tribute.
Already has an M30B35 swap, 5 speed, LSD, period correct Recaro front seats, M-tech steering wheel and gear knob & Bilstein suspension. I have the Alpina wheels too, but they're not on the car at the moment as they need a refurb
I'll probably end up going with Alpina B6 kit as it's easier to get than the m-tech 1 or 2 now, although I like the sleeper aspect of the car as it is