I would use a combo of Jamf's Composer app ($99/Com,$79/Edu) and Apple's ARD3 to create ARD-pushable .pgk files.
Composer is able to 'watch' as you install and configure a software package and keep track of all the new files added, old files modified and any preferences made during the installation, then will create a .pgk file of all these changes which you can then push out to the Macs with ARD3.
ARD3 is able to push out prebuilt .pkg and .mpkg files from software companies, too.
If you want to forgo ARD3, you can distribute the .pkg files over a network/on a USB thumbdrive/on a CD/DVD and have local user admins install them manually.
The Casper Suite mentioned by tron_jones can be quite expensive, and is designed to support Macs from soup to nuts. It is a bit of overkill for your purposes now, but perhaps can be of use in the future as your Mac's presence grows.