Keep the Sirrus for your pavement or commuting whatever it is.

Now, you expected to get $400 for the Sirrus and have $700 to spend, which means your budget is now $300. Expand it a little, and get this: http://www.jensonusa.com/store/produ...o+08+Bike.aspx That's what you want for stairs. Then you don't need some compromise bike that will be okay for commuting and okay for urban. You'll have two bikes, one purpose built for commuting, the other purpose built for urban.