Yup, I have a similar system (into my garage) for the summer. I use Koolance Quick Disconnects to allow me to move the rad inside in the winter. Part of my redesign would be to keep the hard-plumbed loop in place and leave the pump outside all the time. Just relocate the rad for winter.
Also, uber nitpick, the pump should be before the rad as it adds (the tiniest bit of) heat to the water and you want the water to be as cool as possible (non-condensing) when it hits the CPU water block.
This is the unit I use, but don't do that unless you are cooling multiple systems (several kW). This is the one I would get were I you. Integrated rad, fans, pump, res, and control for all of it.
Oh, and a warning. I really like the Koolance stuff, but check here before you order; every part is a distinct P/N that needs to be spec'd separately. In fact, I have quite a few fittings and misc that I'd send your way were you interested in doing this.