Ya! I agreed. All colours are the same, need to clean it very
often.
I think it is very much depends on you, what colour do you prefer
most.
However, heard that some colours which is not very popular, got to
wait longer. 
BTW, anyone can advice how can I maintain Altis well? Esp. the
engine part?
Any "Kamasutra" (top secret) for taking care of Altis with lowest
maintainence cost? Budget control... 