The D5 is probably your best bet for power and ease of use. I hope you can find a Canada shipper. If they're as good as a D4 you'll be getting a great pump.
As far as a rad or a core it's a bit more complex. It mostly depends on how much you want to spend, and since rads have dropped in price even that isn't as much of an issue as it used to be. Anyone who says that one is better than the other is simply offering their choice as a binding fact. I've yet to see a direct, quantifiable comparison between rads and cores. The truth is that even a 3-source loop isn't going to challenge the dissipation potential of a 2x120 rad or core.
If you don't mind dinking around a bit and want to save a few $, get a core. If you want something that looks nice and clean, and that you can slap right in, get a rad.