I currently have WAAS running an EZ Guide 500 and EZ Steer. Local Case-IH dealer quoted that if I wanted to upgrade to Omnistar it would be $3000 for the receiver to go to XP and another $3000 for the receiver to go on up to HP ($6000 total), with the annual subscription on top of that. Is this right? I thought the same $3000 reciever woud run either XP or HP, but they said I was wrong.