by cyrano138 » Sat Jul 14, 2012 10:34 pm
I have a few Abus 83/45's and I have to say they were a nice step up from basic Brinks and Master locks. American padlocks (look for the older, square keys that indicate they weren't manufactured by Master) are also quite a nice challenge for someone in your position. After that you can start on some SFIC cores (like Best or Arrow)--that's what I'm trying to learn before I move up to Schlage Primus or Medeco....
That's the progression I followed, so I can only attest to what worked for me. Hope that helps.