Jorge,
I was thinking about attending some of the local real estate investor club meetings. They seem to meet on Wednesday's and Saturdays. Maybe we can hook-up there.
Jacob,
I think just some neighbohoods in the northeast and some neighborhoods in the lower valley you have to watch out for. You should be able to get better information on crime areas on the city-data website. The east side of town seems to be expanding the most these days. I have only lived in this area for 10 years, and spend most of my time across the border in Juarez where I manage a production factory, so I am sure there are folks with much better knowleadge than I, but so far from my research, the Northeast, lower valley, and central/downtown portion of the city seem to have the most multi-family opportunities.
You should also check out Las Cruces, New Mexico if you are looking for multi-families. It's not very far away from El Paso and some residents live and work between the two cities.
Regards,
Matt Harmon