I have recently purchases an 120 Vac to 12 Vac transformer similar in design to the one shown here. I am curious as to the best way to wire this up. I am not a big fan of making a suicide cable for the obvious reasons of electrocution. If I pick up a set of these, would it be safe to splice and solder a 120Vac power cable into the connector?
What you're looking for is some kind of IEC Power Entry component. Digi-Key and other distributors have tons, with or without fuses, and with and without protective earthing. Personally, I like using the ATX power supply style IEC C-14 connectors, because I have tons of those cables laying around. This one also has a built-in fuse holder (remember to also get fuses!) http://www.digikey.com/product-detail/en/723W-X2%2F03/Q205-ND/245546