I agree with grieve, it is better to do the research and get all the parts that are the best. If you buy a kit you just end up with whatever the best part that company makes is and no company makes the best of every part. Swiftech has some decent kits and
Petra's tech does as well, if you must get a kit.
I also agree that it isn't really a "mess" assuming you do it right and plan everything properly.
As for parts I agree with gireve on those as well with a few amendments,
The Swiftech MCR320 is much cheaper than the Thermochill and only cools about 2C worse than it. I recommend the Swiftech if you are on a budget, but go for the Thermochill if you can. Neither will disappoint.
The MCP655 is a good pump but, an MCP355 with the XSPC top will give better performance with less heat dump and smaller footprint. I think it will cost a tiny bit more though.
The 7/16" tubing is good but also consider 1/2" only because there are more tubing options. 7/16" is good since it provides a tighter fit with no flow restriction compared to 1/2". 1/2" however, will give you a wider choice of tubing when it comes to color and quality. 10ft, is usually the recommended amount of tubing, but I have exactly 6ft in mine and I have a CPU block, pump, res, 2 rads, and a gpu block all mounted inside a large Lian-Li case so you may not need 10ft.
The CPU blocks he recommend are very good but also consider the EK Supreme if you are going to run a CPU only loop. It seems to perform slightly better than the other blocks, but none of them will disappoint.