If your budget can't stretch to an Apple iPad then consider the Archos Arnova 7 G2, an entry level tablet that comes with some surprising features.
Like the original iPad, the device, which sells for £99.99 at Carphone Warehouse, comes with a 1GHz ARM Cortex A8 chipset (the Rockchip 2918 with a Vivante GC800 GPU) clocked at 1GHz and 256MB RAM (although Amazon says it comes with 512MB RAM).
There's also a 7-inch capacitive touchscreen display with a 800x480 pixel resolution, 4GB onboard storage expandable to 36GB via a microSD card slot, Wi-Fi, a microUSB port, full HD video support, Android Gingerbread 2.3 with Archos' own Appslib store (but no Marketplace due to licensing constraints), a VGA front-facing camera, up to 18 hours battery life (when playing back music) or six hours (when viewing movies or browsing the web) as well as a kickstand.
It is the first sub £100 tablet to combine a 1GHz chipset with a capacitive touchscreen, and although some reviews are mixed for the Arnova 7 G2, they were written when the tablet was priced at its original suggested retail price. Other affordable tablets around this price range include the Ainol Novo 7 and the Kogan 7-inch tablet.