Nexus 7. It has a Tegra 3 quad core processor, and an insane pricetag of $200. But it's not going to pose a threat to the iPad.
The Nexus 7 is really a different market compared to the iPad. Most of people who buy tablets falls into two groups - 'I want an iPad' and 'I want a tablet'. Those who can pay the price premium for the iPad will buy an iPad, regardless fo the competition. Others, those who don't plan on buying an iPad or already has an iPad will probably buy the Nexus 7.
The Nexus 7 is really a different market compared to the iPad. Most of people who buy tablets falls into two groups - 'I want an iPad' and 'I want a tablet'. Those who can pay the price premium for the iPad will buy an iPad, regardless fo the competition. Others, those who don't plan on buying an iPad or already has an iPad will probably buy the Nexus 7.