The S7300 is still not that bad if you're on a budget and just want a standard 7-inch tablet. It's not a powerhouse game system, but chances are if you're buying these kinds of devices in the first place, that probably doesn't matter much to you anyway.
The only real competitors for the S7800 are the Archos Gamepad 2 and the Nexus 7. The Nexus 7 is an official Google product and has a huge userbase so that's a plus, but on the downside it lacks physical controls so you'll have to buy a controller for games. The Archos is more expensive and actually a little less powerful, but it has bluetooth. Yinlips also has a thing, but it was released months ago and probably not as powerful.