Wade's. There aren't that many armor sets for rogues. Go for Shadow of the Empire or The Felon's Coat. They're some of the best armors for rogues.
If you're powering him up through Str, not Cun, then any of the top heavy sets will do.
Superior Drakeskin is very useful because you only have to pay 10 sovereigns to get it and the reduced fatigue can allow you to use some of your best skills more often.