I got the 7900 xtx pulse. I don't overclock or undervolt. I picked the pulse for lower power usage by default (365w vs +400w). Only in the most demanding games do I hear a slight fan sound, and my hearing is slightly bad so keep that in mind :). It's more quiet than my previous nvidia cards. My hot spot temp differential is very low like 5C - 8C.
If you want to do OC, then maybe the Nitro is the way to go.
I had a difficult time making the same decision due to few reviews on Pulse, then the price on pulse dropped under $900 and I just went for it.