hi im currently deciding on a cd/radio system,i have shortlisted the following.roberts mp23,denon s52 dab,nad c715 dab, and possibly the forthcoming vita audio r4 dab/fm/cd system.of those that are mentioned and available now.which system has the best dab performance,fm performance,and the best am performance.also has anyone bought the nad c715 dab receiver,and could give me some info regarding sound quality of the radio and cd and ease of use.thanks steven lloyd in cornwall.