I suppose it depends on the price as well as what I think my chances of success are if I build it myself. I would definitely need help with the design, since I'm just learning this stuff. I've got most of the basic gear and am watching the MIT opencourseware for the 6.002 class. It's probably a bit too ambitious for a first project, but at the moment I'm just working on trying to repair broken electronics gear.
I saw the reference in an earlier post about batteries and it got me thinking perhaps I could repurpose one of my APC 3000VA rackmount UPS units for the job. Not sure how feasible it would be, but it would give me plenty of existing parts/material to work with. The only thing I'd need to do to it cosmetically is create a new bezel.