If you want one of these pistols, consider the Erma Werke copy which was assembled and marketed in the USA as the Iver Johnson TP-22 and TP-25.
Deceased TFF member Bill Goforth had some significant involvement with them. Here is a link to a thread here. http://www.thefirearmsforum.com/showthread.php?t=20136
Frankly, the IJ TP-22 is an excellent copy of the Walther TPH in .22 RF, with some insignificant and significant differences. They are made a little less expensively; but they work as well or better than the German or US made Walthers that they are copied off of. Current market price seems to be around $200.00 in excellent condition. Both a .22 RF and a .25 ACP are currently listed on two Internet auctions.
The safety blocks the FP but does not drop the hammer. You have to apply the safety and manually lower the hammer for hammer down carry. Of course you also have the option of carrying an Erma TPH or PPK close copy (almost clones) cocked with the FP blocked by the safety. Most if not all of the IJ TP-22's also have an automatic FP block that allows the gun to be safely carried, with a round in the chamber, hammer down and manual safety in the off position. Walther TPH's produced in the USA lack this safety feature.
My personal opinion is that the .22 RF is a better choice than the .25 ACP, today.