personally i know that the v1 does better than the others in all tests but ya the rear view mirror seems somewhat lame to me. im goin to go with the concealed display and call it good. what source is saying the bel is better? bel is even worse than the escort x50 which is the next best model to the v1. stage 3 on the clutch is just a rating for power handling and i'm not sure what the rating is but it is very sticky on grabs and makes shifts throught the gearing ver cuick even if they are a little rough. burnouts are instant with the stage 3 as there is very little slippage point.
i don't have sway bars but in a 5 series you will for sure feel a huge difference. i know that racing dynamics makes a great one for the e34 but i'm not sure about the e39... it'd be worth researching online to figure ou the best seup for your particular car which i can definitely help u with if you'd like