Same here. The WD My Book AV has worked perfectly. I really don't know why you would want anything much bigger than a 1TB drive? The 630 tend to break down quite often so once you get a new 630 the programming on your eHDD becomes lost when you hook it back up to the new 630.
Newegg dot ca is selling the WD My Book AV for 119.99 plus 12.24 shipping plus taxes and fees. That's about the best price I've seen on this drive.
Shaw Direct DSR 630 HDPVR w/Ontario Life | Aquos 46" 120Hz LCD TV | Watch Me!