the closest i've come to that colour was on my old moorland grey astra, i had very good results with bouncers sherbert fizz, another wax that i like but just above your budget is ODK glamour i get great results on my black mk2, their sterling is good too and meets your budget! i think yo cant ignore poorboys nattys wax for £17 but i find it only lasts around 4-6 weeks and chemical guys petes 53 is good too and can be found under £30