a good choice?

[LoneWolf]

Hopefully I'll be getting my CCW permit within the next month or so. So now comes the question what to carry?
I currently have a Springfield XD9, and really love this shooter. Very accurate, never jams up, and love the safety system on it.
I may carry this most times, althought down the road I plan on getting a 45 cal also.
What I am wondering is what does everyone recomend for a smaller pistol to carry on light clothes days? In my mind I keep thinking, stick with XD pistols. The last thing one should worry about if needing the pistol is different safties and shooting habits.
Does anyone currently have the XD9 Compact? Is the marginally smaller size worth it? Or should I just stick with my current version and get the 45ACP XD9 now?
Another gun I had considered was the Walther PPK-S. I have always liked this little number, but other than to satisfy an itch, not sure on its carry use, let alone the 380cal stopping power.
Look forward to getting everyone's opinions, and I'm sure they will very across the board.