I have directv in three rooms (living room, bedroom, and basement). I already have HD in the living room (so i have the HD dish and HD access on the account) and would like to upgrade my basement receiver from standard to HD. If i would go to best buy and buy a new HD receiver for $99 would there be any extra charges from directv when i call to activate the new box? I also realize that buy a new box enters me into a new two year contract and am not worried about that. All i want to know is that after the purchase of the HD box would there be any charge from directv to activate it or anything else?