Warwick Red Label are available in both Stainless Steel and Nickel. Used to use the Stainless ones, which were great, lasted well but a bit rough. Then discovered Fender Stainless Rounds (now discontinued), which I thought were excellent (and reasonably priced too), but then they were discontinued.
Searched around for something similar, tried some Elite Stadium's, but I didn't like them this time around (used them in the past). When I couldn't get hold of the Fender's anymore, moved to Dunlop DBS Stainless. Again, decent sound, decent longevity, reasonable price. All good, until I bought my 4003, which didn't seem to get on with the Dunlops, just didn't sound anywhere near as good as it should have. I'd heard that D'Addario ProSteel's were supposed to sound good on Ric's, so I bought some to try out. The 4003 came alive, so that was that.