The Cannondale Quick CX 2 comes to mind. The MSRP is $1,100, but I believe you can get one for $1,000 or less if your LBS carries the model. One potential issue is size. I believe the smallest frame size for the Quick is 17-in. I'm 5' 5" myself, and I felt as if the 17-in. Quick CX was a little bit too big for me.
I bought a Trek 7.5 FX last week - mainly for commuting, riding around the neighbourhood and single track trails, and occasional mid-distance cycling. They offer a 15-in. frame size, which I find to be perfect for me. The MSRP is $1,099.
As for securing the bike, I use a combination of a U-lock (Kryptonite KryptoLok) and a cable.
Hope this helps.
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The value of your life doesn't change based on the way you travel. - Dawn Schellenberg (SDOT)