I doubt anyone but me would buy a smartphone for a gophone account, but I'll post this anyway.
Do not buy a motorola device unless you want to pay for background data usage. All android devices are not created equal & it is impossible to turn off background data but still use wifi on moto devices. For example, it takes 27 kb of data just to connect to my home wifi network with the flipout.
All I wanted was a pocket sized device that texts easily, and takes photos. I thought the wifi & android apps would be fun for home use. I should have spent a few more dollars for an HTC aria. You can turn data use off, it is more pocketable, and has a better camera.