With the advent of slides, Newell began putting a Girard power awning on for the main awning since ZipDee didn't have a lateral arm awning. Newell continued to use ZipDee window awnings. About a year ago ZipDee began making a lateral arm power awning. Both ZipDee and Girard make a very good product.
Their respective websites are:
http://www.girardrv.com/
http://www.zipdeeinc.com/
I suspect that Newell could get you either brand. The labor to replace an existing ZipDee with another manual ZipDee is fairly inexpensive. Changing to a power lateral arm awning increases the installation cost dramatically. ZipDee now also makes a power awning with has the same type vertical arms as the manual awning and powered by 12 volts instead of the 120 volt power requirements on the lateral arm awnings.