Are you looking to spend up to a grand on a second bike or are you looking to buy a bike and get rid of the current one? If the latter, you may want to look at something designed to be a little more of a roadie then a commuter.

I personally like the Specilized Sirrus line. I have the Sport (MSRP $610) and why I am not quite up to 20-25 miles a day, the bike could do it fine. And at you price range, you could go with Elite ($810) or Comp ($1050).