I think that you need to reconsider your objectives, because they seem to overlap each other.
If you have a PC-65, then you probably don't want to change it, unless it's for a bigger Lian-Li case, which I don't think exists (not sure, what's a PC-75?).
I wouldn't use two rads, one should be enough. If you insist on using two, then I would stack them, hook them up in parallel. That way they won't take up much more space. A real upgrade would be to setup a push-pull fan for this/those rads, to increase the airflow. A heatercore would also perform better.
Your pump is fine. If you really want to upgrade, then get two Via pumps, and hook them up in series. That's if you can fit them, of course...
You need to ditch the silicone tubing. Even vinyl is better. 1/2 inch tubing wouldn't hurt, but you'd have to change the barbs on your WB and RAD, so if you're up to that, go for it, otherwise leave it alone.
If you want to upgrade your rig, you might consider adding a flow sensor, and a circuit to either let you know that there is no flow, or something that'll sound an alarm, then shut off the PC after a fixed period of time. With two pumps though, it's not a worry.
You might also consider cleaning up the wiring. Add a power plug to your PSU, and wire in a relay so that everything turns on together.
A couple of status lights, and you're up and running.
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