Microsoft's Surface Pro 2 is one of only a handful of tablets that come with Windows 8.1 Pro, allowing it to join domains, process group policies and do other enterprisey stuff. It's also pretty well-endowed, technically. Surface Pro 2 contains a fourth-generation Intel Core i5-4200U dual-core 1.6GHz processor with 4 GB or 8 GB of RAM, and is available with 64 GB, 128 GB, 256 GB and 512 GB of solid-state storage. There's one full-size USB 3.0 port, plus a Micro-SD card slot that can add as much as 64 GB to that. It supports SD, SDXC and SDHC formats. For about $100, Microsoft offers a keyboard that doubles as a screen cover. An optional dock adds USB, display and networking ports. There are 720p front and rear cameras, dual mics, a stylus and a Mini DisplayPort (an adapter costs extra). Surface Pro 2 includes only Wi-Fi a/b/g/n and Bluetooth 4.0; there's no mobile networking option. Pricing starts at $899 with 4 GB RAM and a 64 GB SDD.