I also own one steel bike, it is a Bianchi Eros - which is fairly inexpensive with stock components. I did not like the stock build and changed everything except the frame - but if you are happy with the veloce or centaur group it comes with, and with alloy seatpost/handlebars etc then it should be in your price range. Also you can find several of them used - either 10 speed or 9 speed - for very low prices, around $500-600.
It's a very good bike.