You could always put your DH in business class on his hard-working own with the rest of you enjoying the journey as a family.
Personally, I'm not overly thrilled by Premium Economy and am delighted I didn't bother to pay the extra when I last flew to the States. Admittedly I don't know which part of the States you are travelling too but I did a 10.5 hour flight that was perfectly OK in economy. I also had to return to work straightaway when I got back to the UK but I'm still alive to tell the tale.
Your children are quite old enough to travel in a different part of the plane but it's not exactly nice to know you don't qualify for nicer seats simply because you are children. So if your DH can't face the idea of flying in any other class than business either let him get on with it or yes, go somewhere else.