Honestly 450 sounds pretty good if that's all in. I believe I was around 750ish all total, but I also went with a dual rad setup. That was an xspc cpu block, rads, fans,and pump, ek gpu block, a couple different branded fittings, and soft tubing. Like stated above, not a cheap way to go.
Definitely do a lot of research into water cooling, and whether or not the price vs performance is for you.