Whenever I get an order that includes one of these 2oz silver coins and get to bust them out to do some engraving, I realize just how awesome these 2oz rounds are.  They really are my favorite coin that I've made.  The design and size are perfect for this application.  If you don't own one, I'd consider scooping one up to see for yourself.  There's a reason why this was the design that was chosen for the 4oz platinum and 4oz gold rounds (and the fact that the size made it a perfect fit).  While not everyone wants to drop down the $ for the 4oz platinum version, it is nearly indistinguishable from this 2oz silver version, so if you squint you can't even really tell the difference other than the weight.  Just tell yourself it's platinum.