I think the guy was just braggin...1gb is fine, 2gb is optimal, 3gb is overkill, I don't know of any mainstream app that uses that much ram, yet.
- - - Updated - - -
Nexus 4, still plays everything there is out there just fine. It was a good phone, using it since it was launched. If you can get a nexus 5, that will be cool. I don't plan to go back to non-nexus phones. Just saying, I find the experience of a nexus top-notch. But to each their own. I would say get a nexus 5 though.