Del,
stayed at Rothiemurchus,I agree,its a good site.We use this site 3-4 times a year.As you say,great walking for all ages and levels of fitness.
I read that the Glenmore Site further up the ski road has been upgraded but to be honest did'nt really like the look of it on a previous visit.
Although we have'nt stayed there,just did'nt get a good feel for it.