Mate...
I highly recommend Zymol Vintage if you have several dark color vehicles. Its pricey but is only worth it if you have a few cars to do and/or have mates willing to chip in with you. I chipped in with my brother, sister and good mate to buy Vintage but its benefits apart from the 1st class shine and care is the unlimited refill for life. Works out well because our all 7 of our cars are waxed once every 1.5 months.
URL:
http://www.zymol.com/zymolvintageglaze22oz.aspx
Alternatively the other product i would recommend would be Zymol Destiny.
URL:
http://www.zymol.com/zymoldestinyglaze8oz.aspx
This is what i was using for the past 1.5yrs until i managed to convince my bro, sis and mate to chip in with me on the Vintage. Black comes up like a dream with Destiny and is best bang for buck.