if you truly want a BBK, I would say go with the RR kit:
http://www.ft86club.com/forums/showthread.php?t=90379
it's pretty affordable with good results and it has been track tested.
however, I would personally upgrade pads, fluid, rotors (maybe), and lines (if you want) before going to the BBK. test it out on the track and see if it has enough stopping power. unless your "home" track is going to have multiple 90+ MPH straights into tight turns, I doubt you'll need a BBK even if you're boosted.
I have winmax W5 pads with RT700 fluid and SS lines when I went to SoW and it stopped me fine after I was going 90+ MPH at the end of the straight into the turn. no fade at all, even after multiple laps.