supercharger questions

[bust]

hey im looking at at used supercharger and i have a couple questions.. with all the superchargers out there who do you think makes the best kit? is ERT a good set up? also, where would I go about getting a good sized front mount (like the one AA runs for the SC and Turbo set ups) for the ERT supercharger.. I had a question, the pressure relief valve on a supercharger, does this work like a blow off valve on a supercharger? also, which will hold boost the longest, like till red line.. i have heard AA turbos die off around 5k and im looking for something thats going to be constant power.. as far as tuning goes AA is only two hours south of me, but I dont know if they would be interested in tuning a SC set up by a competing company..

thanks