Ok, i've been reading about both, and still wasn't decided until i found an '04 model pms w/ 3 bar map sensor that i can probably get for around $650 or so. And with the map sensor it will make it nice when im boosted down the road. So my question is, how much is the going rate for a used tweecer r/t? It seems like i dont see them very often. Also, how much are you paying for the laptops to operate them? Used? New? and what type? Thanks for any help, Will