I would strongly advise you not to link your accounts to a Bnet account. With patch 3.2 releasing i was locked offline for 2 days because the bnet accounts use a different auth server then the rest of the world. After calling blizard tech support and then had to call blizard billing "1 hr phone call" to split my accounts back out of the Bnet style so i could log in. They said it was from a DNS setting that wasnt getting update by some ISP. Seems patch 3.2 changed teh bnet auth servers address.

Far as im concerned there is ZERO reason/reward to put them back together.