good for you that you have extended warr. i've just purchased 6/72K.
I guess stock changer unit will be around $600 (just uneducated guess). Everything on VX is outrageous in price. I had fron left schock failed on me at 17K. Guess how much Isuzu paid for it .... $420.00 !
Replacement antenna is $100 or so at dealership - rippoff !