There is no pretty quality watercooling. You, depending on your ability can make a neat external setup. BobbyBubblehead has built an AWESOME external Rad/pump enclosure out of an old case. Exactly what a EXOS etc has, but it has quality parts, and 300% better cooling at probably less cost.
I looked hard at many prebuilt systems. Luckily I was in no hurry and was already a member here and began to learn. 3 months later I got my first WC part and built my loop. Why hurry? It costs money and is a hobby. Do it right or have no fun. I'm still having fun, big time.
The problem with the prebuilt stuff like the EXOS is the quality of the parts and the ability to cool the water is lacking. People who have a true passion for great temps and a quiet system sometimes start out with an EXOS, ThermalTake, etc etc etc. They realize their mistake when they do more research or the POS they bought just breaks.
I'd like to welcome you to one of the better places to learn and share about watercooling. We aren't as uber scientific and uber max best as XS, or as lame and uninformed as MANY watercooling forums out there. We got a great mix of common sense, experts, and I like to think a mission statement to do it right, inform them and help them.
That said, look around. Read many posts. Get a clue first. It ain't rocket science but you can build a REALLY nice system that will last for years with quality parts and a bit of handiwork on your part.
Start with the stickies at the top of this forum. Spend time there, then move to this link.
http://www.tomshardware.com/forum/253958-29-watercooling-guide
Being informed is the key. It's your stuff. We know quality watercooling and how to do it, the rest is up to you. It's fun if your a tinkerer geek and have a decent attention to detail when building stuff. And it's fun as heck to talk about as you build and get ideas.
Get a read-on on some of the info, get overwhelmed, read some more and CYA in a few days.