I have an iMac with os 8.5 (planning to update to OS X later). I just purchased a Dell and would like to use Verizon DSL. 1.) Do I have to upgrade to OS X first in order to use DSL for both computers? 2.)Will I have problems with Verizon's router in linking the Dell and the iMac? 3.) Are any special cards or connectors necessary for the iMac? 4.) And while I'm at it-is there a less expensive way to purchase OS X? Thanks!