New wheels noob....

Hey guys. I'm a bit of a noob, so please forgive me. I've been riding my boardman team carbon road bike around for a year or so, and have been thinking about new wheels. I've upgraded othe stuff (because it was cheaper to upgrade the seatpost then the wheels!) but I guess now the time has come. So what do you guys recommend as far as a sensible wheelset for a boardman? I truly have no idea, other than reading reviews on Evans et al... I have a budget of about 400 notes, but a few quid over would be ok I suppose.
Thanks for yyour help!