So that's all I need? Wouldn't it just be easier to simply buy a kit? I have never worked with liquid cooling before, just air, so I am still a little confused as to what exactly I need and how to put it together.
Regardless of whether you buy a kit or buy everything individually you still end up putting it together the same way. A kit doesn't simplify anything, it simply ships with most everything together rather than you buying everything individually
Not to say any of those kits listed above are bad, but you'll still find something that works better and cheaper if you buy everything you want
Basically I can summarize everything you need:
Pump - for the most part it's a tossup between the Aquaxtreme 50z and Dangerden D5 otherwise known as the swiftech or laing MCP655. They are all pretty much the same thing and it doesn't particularly matter, I got the D4 which is the older version of the D5 simply because it was closer to buy. I would just get whatever is cheapest.
If you have a bit more money you can splurge on a better pump but I assume you don't have that much money. Those pumps I listed probably go for maybe $60-70
Blocks - For CPU the best you can find is the Swiftech storm but it also costs around $100 I believe. A cheaper choice would be either Dangerden TDX or Swiftech MCW-6002 which go for around $60 I believe
GPu again is a toss up between Dangerden Maze4 or the swiftech variant which I have forgetten the name of right now (I think MCW50). Swiftech may also have a storm variant for GPU but I'm not positive and it would probably be a bit more expensive anyways. Maze4/MCW50 probably sell for $30-40
Next up is radiators which I am not very familiar with. My suggestion is just to pick up a cheap car radiator for maybe $20 at autozone and modify it yourself(go to overclocking section and you can see what I'm talking about).
Assuming you use a modified radiator that brings your total to about $200, then add
Reservoir/T-Line + Fillport - $15
Tubing + Clamps - $10
Fans - Depends