you can read a comparison of the Hovland Groove 2 with the Graham IC-70 on the 10 Audio website: http://www.10audio.com/graham_hovland.htm
I have not listened to the IC-70 but I did own one of Graham's earlier cables. The Hovland, which I do own, is considerably better. It is also a considerable improvement over the Cardas Golden Reference which I also had for about a year. Another very good phono cable is the XLO Signature. Its a little stiff, so you have to be careful which turntable you use it with, but this, and the Groove, are my two favourites. I have tried a few silver cables, most notably the expensive ($1,000) Nordost phono cable, and I did not like them at all. Then again, I have never heard a silver interconnect or speaker cable in my system that I paricularly cared for. Obviously, YMMV.