I can't say I have any experience with NZXT AIOs, but I have heard they are reliable. You'll have to research yourself on the ones that suit you best though, because I don't know their product line up. DO look at the h75 for the Phantom anyway, because it's a really nice slim rad that suits small form factor PCs.
PS- Ask in the watercooling subforum if you don't get any more help here but try not to call AIOs watercooling too often, because the proper water coolers might get offended