Sorry for jumping In on this tread but I've the exact same situation and intrested too. Budget is similar and I want somthing to enjoy with my boy who is getting into his bike at the age of 6 now.
I currently dont have one. It seems a minefield and most say hardtail unless you are spending over sort of 1500. I've gone from looking at £1000 bikes to thinking balls to it and seen a santa cruz 5010 which is complete overkill BUT it looks a lovely bike haha.