Just about all of the major manufacturers have APs that would do just fine in a warehouse environment.  Some have ruggedize units that would be suited well for warehouses depending on the harshness of your warehouse environment.  For specific AP models, the answers to some of the above questions would help.

I would recommend looking at at least 3 options as they all have pros / cons and vary on price, etc.

I would second getting a site survey done or do one yourself if you have the means to.

AP placement, density, model, etc. would vary greatly depending on the characteristics of your specific environment.