Ive always had good luck with Apex-i myself, however I havent ever had a turbo stang. I cant imagine it would be different than any other turbo car though.
my friend has a greddy electronic boost controller on his rsx type s, its really nice. now with a turbo i am pretty sure you are going to have to convert your maf to a blow through style.
now to answer your first question, any boost controller is going to be good. You have to options, Manual and Electronic; basically whatever your budget can afford you should get... lol Apex-i is a nice one, but if you look you can find some of the boost controllers that have a turbo timer inside of them also and this is the one that i'd be looking for and choose.