The Rega Planar 1 Plus has a built-in Moving Magnet phono stage, which means no additional box/cables for an external phono stage. The Planar 1 Plus has Rega's RB110 tonearm and a Rega Carbon MM cartridge. Connect the Planar 1's line-level output to the A5's rear panel input using the included RCA to RCA cable and viola, the A5 speakers can now play your vinyl! There are no extra cables to buy and visually the cable count is quite a bit lower than most.
The audioengine A5 is one of those gem-of-a-powered speakers that has both a remote control and a volume knob right on the front of the speaker. Compared to the A2, you gain bass, a larger amplifier, remote, front panel volume, and more inputs and outputs. It comes in two versions: A5 ($399) which is a traditional powered analog speaker, and A5+ ($469) which adds bluetooth - the photo showing the little antenna is the bluetooth version.