All in one systems are all about balance. Attempting to cram an entire PC's worth of components into the back of what amounts to a slightly wider-than-normal display can be an iffy proposition. Pare down the specifications too much and you wind up with a limp machine that's obsolete by the time you get it. Jam in too many high-performance components and the price skyrockets to a point that you wonder if a different form factor might have been a better option, not to mention the additional thermal and acoustic concerns.

Lenovo's B Series all in one systems are decidedly mid-range in both name and performance. You can opt for the low end in the C Series, which come with either a Celeron or Core i5 CPU. Or you can jump to the front of the pack with the A Series, which leads the way with more powerful components, including a 2.8GHz Core i7 CPU and a 27-inch screen. The B Series is situated right in the middle of the two...