asset management software

I want to roll out some sort of asset management system in place that can tell us what all of our systems are running and how up to dat they are.
I have tried to go with a free solution OCS Inventory but I keep running into issues with consistency on scans and the agents not finding all of the software installed on the computers.

I should also mention that i need to scan and log systems in 90 remote offices that have no vpn capability so the tool has to work over Wan connection without having to punch holes in ever firewall.

ORLANDO, Fla. - Data Transfer Solutions, LLC, which provides professional GIS (geographic information systems), asset management, software engineering and web development services to government agencies, has launched a new online service to help local governments and their agencies qualify for American Recovery and Reinvestment Act (ARRA) funding.

ORLANDO, Fla. - Data Transfer Solutions, LLC, the Avalon Park-based firm that provides professional GIS (geographic information systems), asset management, software engineering and web development services, was recently awarded contracts to provide services to government agencies in Texas and Vermont and The Wildlife Conservation Society based in New York City.