Never really been keen on white tbo, inmho as stated above it means far too many hours spent cleaning!!!!

On the other hand, steel grey, not bad at all for keeping clean!
Re good valet/car cleaners Bournemouth area, I have to say, I've tried a few and most are crxp! However, tower park tescos, autoglym team there do pretty good job, used them a few times and overall been happy, £20 for the outside, never really bother with the inside as can do this easily myself. Plus within the hour they have your car cleaned, polished and raring to go! Other than that, there are a few smaller car cleaner/valet companies, however tad pricey and if you're considering white, you may need to take out a second mortgage!!!

Oh, one last thing, avoid American car wash as for the money they really are a rip off!!! (sorry if you know them or have mates there, but I do talk from experience!)
Either way, all the best with your decision!!!