[FSTASNTZ]

I have read the procedures and understand them and I am in the process of obtaining all the materials. Previously I have used Zaino, but I am looking for a little better result and protection on my cars for the level of effort involved.
Here is my question, besides the MF towels, the PC 7424, assortment of pads, wash glove, water purification (well water) and three buckets, what products (exterior & interior) should I use for the following cars:
2009 BMW 550i Space Gray Metallic with black leather
2008 Mazda MX-5 Copper Red with tan leather

With so many options out there, it is almost impossible to make a determination.
Thanks in advance.