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If you want a serious weapon for your 40S&W, I would highly recommend the EAA Witness in that caliber.
A nice thing about the Witness line of pistols is that once you have your main wepon of choice, all you have to do to "upgrade" it is to purchase a new barrel, slide and magazine for $229.00 and you can have any of the calibers that they list. I currently own a Witness in .45ACP with a .38Super upgrade kit. I am also considering purchasing the .40S&W kit in the near future.
I was also going to recommend he Kahr K40, however after going to their website http://kahr.com/pistols_front.html
, I see that their pricing is a bit more than you desire to invest in a sidearm.
Good luck on your quest for a weappon to suit your needs.
I'm sure others will follow to give you their recommendations also, so stick around a while - and while you're at it, why don't you visit some of the other topic areas that we have. I'm sure you will find something somewhere on our site that will be to your liking and or amusement.