Waterblock (and backplate) came today, it was fairly easy to install, took about 2 and a half hours all in all including draining the loop and putting fresh coolant in. Card is so heavy now it's visibly weighted down at one end in the case, lol.
Temps are amazing though, gone from 50-60 idle to a pretty rock solid 30 degrees. Hasn't gone over 45 degrees yet with the games I've tried. Well worth it, especially as now the PC is virtually silent even under heavy load.