I am a current DISH subscriber (a little over six years.) I own a 510 and a 501. I am under a commitment to DISH until November. Is it possible to switch to DHA? According to my math it would be cheaper to lease a 522 than it would be to continue with my setup for AT180 and locals. My current cost per month is $62.96, if I pay annually it drops to $59.96, but if I switch to DHA it would be $57.97.