For what? (If I buy this, I'd have 3 monitors anyways. But is everything else solid?)

The more monitors you have the better. You won't know the true amazing-ness of multiple monitors until you have multiple monitors. And yes, this is a solid rig. However, if you were building yourself, you could build a PC capable of steering spaceships for $3k.

Is it easy to hook up multiple monitors? Btw, I just just upgraded my video. Check the OP for details.

All you need to do is plug them into a wall-socket and then into the back of your GPU. Windows will automatically do the rest.