Hi Arman, nice to hear form you again. And congrats on you latest purchase. In Belgium white is quite a rare colour, but I think it looks nice on your car. 8)
I don't know for sure in the E30 range, but in the E36 the 1.8 is actually to be prefered over the 2.0 because the engine is a lot lighter and therefore the car handles better. But I admit that I'm looking for a 2.5 (not a V engine though) to be my next car also.
BTW, I've covered 270k kms wth mine and I'm sure it'll go over 300k without problem, so no need to worry about BM's reliability.
If this is your first RWD car, I advise you to go out and play on a big parking lot before pushing your car ino a wet corner on the open road.