After moving with two sons who were painfully changed by the loss of their beloved friends, I would suggest the following: Move into a great neighbourhood as much like the one you're leaving or better (swimming pool, tennis courts, visually beautiful), close to school and things they like to do. Do not live in a remote area. It is more painful if they feel isolated. It would be better for them if you live in the same neighbourhood where kids from their school live, so they could walk or bike to friend's houses.
Research the school carefully. Be certain they will want to be there. They should spend a half day (including lunch) at each school they are considering. Spend 4 or 5 days in the city before you all make the choices for home and school. Give them control over these choices.
Don't tell them they'll adjust or like where you're moving to. This denies their current feelings. Right now, they don't want to like it. That would be disloyal to their friends if they did.
Drive around. Explore the city. (Get advice on where to go first). Plan a visit back to their old city and friends for the next holiday. Set up skype so they can keep visually connected with their friends.
Material things will not replace the deep loss they will feel so don't tell them they should be grateful for what you have done for them. (After all, you are the one who made them move right?) Making new friends, being connected and involved in activities will keep them busy during the first painful year of adjustment to this loss. Give them opportunity at home to voice their feelings and new experiences. Weekly sessions with the guidance counselor or or family therapist could be a sounding board and give helpful advice for the whole family. Don't just stand by and hope they will adjust. Hug them and tell them how much you love them every day.
They will feel better next year.