The Vizio tablet is a pretty solid budget tablet. I bet you could find the USB port in a heartbeat too
Why not also consider the HTC Flyer too? It's reviewing on our site, and the hardware is top drawer (a bargain even now that the price is reduced to $299). You get a GPS, dual cameras, microSD card slot, a better display than the Vizio and a unibody partly metal casing. It's 7", a pretty common size for tablets; the Vizio's 8" is more rare (one of the reasons Vizio went that size).
-------------------- Lisa Gade Editor in Chief, MobileTechReview