The last 2 years am waxing monthly my dark Blue 520 (2 years old) and grey BMW Z4 (1,5 year old) with P21s carn wax. Both cars are polished with KAIO every 5-6 months. Now my P21s finished and I need to replace it. What do you reccomend me around 25-35 pounds... With this money can I find something better than P21s ???