Iksar Necro the only Necro?

[Gnomish Elite]

I see this has been heavily debated and I'm trying to figure out how much race is going to actually matter for Necro. Is this only a small difference or is it so significant it really isn't worth playing anything else? I'm not big into min/maxing but I also really don't want to be extremely under powered.

I see plenty of Dark Elves, Humans, Gnomes, and Erudites roaming around so I feel like it can't be that big of a deal, but I'd really like to hear from some more experienced players on the subject.