The Ithaca SKB Model 100 with 26" barrel would be IC/M, and would meet your requirements--except it has a SST. But an extremely solid gun at a very good price (under $1,000). You might check out the Fausti Styles that Cabela's has been selling. I believe they are OK with steel, and in your price range. Older Bernardellis with open chokes would also be OK. Actually, I'd say any gun from the 60's or newer with chokes no tighter than mod should work, as long as you don't shoot anything larger than about #4 steel. Browning warns not to shoot steel through its Belgian guns, but the real concern is the combination of tight choke and large steel pellets.
