Both Jimbob and Yung.gunr bring up interesting points.
First, I think Jimbob is correct in his assertion that, over time, any price difference between a 380 and a 9mm will balance out in favor of the 9mm just because the price of ammo is different. This isn't to say that 380 is a bad choice, just the you might pay a small premium for compactness and controllability. If money is at the top of your list of concerns, then 9mm is the way to go.
Yung.gunr mentioned the Taurus TCP, which is another .380 that probably doesn't get enough love. He did mention that he didn't see the point in a chrome or stainless finish on a pocket pistol - allow me to cordially disagree and explain why. Both of those finishes/materials are corrosion resistant, quite apart from being, in some eyes, aesthetically pleasing. Corrosion resistance is important in a carry piece, because a pocket is one of the most hostile environments most guns will ever see. They are dynamic environments filled with movement, moisture, dirt, and lint. You want to see a gun rust, stick it in a holster that doesn't have the leather tanning acids neutralized and leave it in a humid atmosphere. You'll be floored. Add in lint which seems to be able to specifically seek out functional areas of a pistol, and you've got a tough place to live. Personally, I clean/lube my pocket carry gun, a stainless P238, every two weeks at least, fired or not. If it were blued steel, I'd clean it/lube it every week to prevent rust. I already found out how easily it can happen on my old P3AT (since cleaned up, reblued, and given as a gift to a family member in need of a pocket pistol)... and how quickly. By all means, get a blued pistol if you want one, but please take care of it, and consider stainless/chrome as investments in maintenance/reliability improvement.
Jimbob... yes, "it ain't a talisman"... something good to remember when life tempts us to neglect our responsibility to practice regularly. Also a good point - if you shoot it, you truly will find out whether there are problems with it. In fact, the only downside to practice is the cost!