personalised plates are just that, personal to the owner, if you like the look of the plate then go for it, if it makes others recognise it then fair play, whatever and if it makes you giggle too then thats a bonus. B457ARD on a 3door anyone LOL.
I do think that if you have to try too hard with spacing and types etc then it surely isnt worth your time effort and hassle from the plod, IMO std type and even spacing if you can