NIS / Ghost Subscription Questions

I have a current subscription to NIS 2009 and recently installed a trial version of Norton Ghost. I was wondering...

 

* Should I decide to buy Ghost, am I eligible for discounts or "upgrade" pricing as a current Symantec customer?

* Will a purchase of Ghost affect my subscription to NIS in any way (like reducing my suscription period or, worse, disabling NIS entirely)?

 

Thanks in advance!