Don’t bother with DVD Santa, and Nero Recode would not be my first choice either.
ConvertXtoDVD certainly claims this capability, but I have never used it for this process. If you must purchase a tool for these conversions, this is the one I would get. The trial will leave a watermark (not removable), but you should be able to test the program and see if it will convert the dvds to your satisfaction.
The best single step converter for this is ProCoder, but it is extremely expensive in comparison, and won’t keep menus.
You can also try a free conversion tool called AVStoDVD. It can use complete dvd video as input and output in either PAL or NTSC formats. There is a setting within AVStoDVD in Preferences–>Encoding, where you can select PAL speedup with NTSC film. This is a new addition to the program and I have not used it, but it replaces DGPulldown for conversion of the frame rate. http://www.videohelp.com/tools/AVStoDVD
Since AVStoDVD is completely free, I would experiment with it at least once and see if it will perform this converstion well. Use the HC encoder within AVStoDVD for best quality output. Unfortunately you will lose menus using AVStoDVD, but the program will let you build a new one.