Audioengine may have started to enter the market with 'proper' speakers, but they ended up producing very very good multimedia speakers as I've said, hence why their taglines are things like
The perfect audio upgrade for your PC or Mac, and
Small Speakers, Big Bass.
The Audioengines
are good speakers, I'm not saying they aren't, I'm just saying if you really want fantastic performance, there are much better options out there. Also, please correct me if I am wrong, but you'll only need one extra cable to power a pair of monitors, in the form of a power cable for the other speaker?
The Audioengines aren't active speakers, they're just powered. They have rear-firing ports which makes them very sensitive to where they're placed (a big issue when it comes to sitting on a desk), and they only have a minijack input (a cost-cutting measure) and spring-clip connections (another cost cutting measure, which doesn't produce a particularly good sound).
A pair of speakers like the KRKs are active, not just powered. They have front-firing ports which reduces their dependency on correct placement, they have RCA, XLR and Jack inputs (allowing you to use good quality cables) and they have HF adjustment controls allowing you to change the way they sound if you want to. 4 x cables - 2 x power + 2 x audio coming from one socket.
A good hifi will easily outperform the Audioengines, and won't need '7' cables as you put it. 1 x mains cable, 2 x speaker cables, 1 x audio cable.