Well then just being honest, I say go ahead and get the Nexus S.
It's hard to turn down Google Phone's actual PHONE, am I right? If you're not concerned about leaving Verizon and hopping carriers, and 4g doesn't interest you too much, then I'd say this is a done deal.
People often talk bad about Samsung in regards to Android, but I think it's a really good move for both companies. And personally, I thought the experience was way more polished on the Captivate/Fascinate than my brother's Droid X.
If you're going to move on to greener pastures, I think it's wise to move on to a phone that's meant to be rooted and played with... and oh by the way, has software priority.