Much better
Now state your questions, by topic.
As for the pumps, from what I've seen in various forums, the L20 is a great pump, but the bigger models may be noisier.
Now if you want a "pro" setup, I'm not going to mention the Johnson pump, because the MTBF just doesn't make it a smart choice, even though it should outrun its MTBF by a large margin. The "pro" choice is an Iwaki pump. I'll let you run a search throughout this Forum for all the good comments on it, and the different model's details.
The "pro" choice is going to include quick-disconnects. They're pricey, and can be difficult to source, but they're around. But if you put the whole PC and cooling gear in the box, then why would you have any external hosing?
Otherwise, you ought to be thinking about how you're going to easily drain this thing, and that means figuring out how to route the hoses to where most of the coolant can flow out.
Copper tubing isn't flexible, so if you want to keep your waterblock level on the CPU core, you ought to mix copper and vinyl tubing.
How and where do you plan on mounting that core/fan/and shroud?