get the jlt rai or cai, it has good gains and it can be painted any color you want. I have even seen people with flames painted on it. looks good and it works.
bbk and mac chrome ones get hot really fast. I had a bbk chrome one on my 99 cobra that was installed by a previous owner and it was all rusted and chipped by the time I got the car. looked like crap and got really hot so I am sure there were no gains.