Looking for a watch for DS who is in Year 7. He'd like a 'grown up' watch but all the 'mens' ones look huge and the children's ones too small / young looking. And I have no idea what is 'cool' (he doesn't either and doesn't really care - but I don't want him to reject it on the basis of it being uncool in 6 months time!). Any brands I should look at!? Thank you!