Well i'm sorry if you can't accept that my opinion my be a little harsh but thats how much I feel about those colour changing paints! You stated that you want a nice ride...well E30's don't look too great with those paints/pearls (In my honest opinion). Pearls done in a tastefull manner and on an appropriate car can be very nice but you are talking big bucks as well due to the fact it is very hard to apply. Also when you get a scratch or a fender bender you pretty much have to repearl the WHOLE car.
Also to colour change your car should add about $1000 to any quote for a respray. So adding a good pearl job will cost you about as much as a colour change.