Hey big mike.. Go for either antec or enermax 400w. If you look at the specs on the web sites, it should show the actual size specs. You should be able to find an antec true power for a decent price. Or, here is one of the best price deals I could find for another brand. I'm not sure of the quality of this particular brand.
Outpost.com has the Ultra X-Connect 500W ATX Modular Power Suppy - Black for $64.99 - $40 MIR = $24.99 with free ground shipping. Plus tax where applicable (AZ, CA, CT, GA, OH, TX, NV, WA, IL and IN).