I am a first timer and will go to Lime Rock with Manny212 and hopefully Monsta. My take: BMW CCA is cheaper and I have heard the instructors are great.
You should also check all the Promotions that the NJ BMW CCA has (several discounts that can be combined, especially for newbies like us).
Lastly, this track is a MYTH!!!
2008 M3 Coupé | 1995 M3 LTW | BMW CCA Instructor