NPPL v PPL
KileA,
Apart from what you have written in your post, it also depends on what you want to do next. If you have ambitions to become a commercial pilot you must do PPL. If you do NPPL, you will be required to do PPL before you can proceed. Remember, PPL, CPL and ATPL are JAA licences; NPPL is a UK only arrangement.
I don't know the details of the NPPL, (I'm a PPL holder,) but I do know the required hours are less for the NPPL, which suggests the syllabus is also reduced.
If, however, the sum total of your ambitions is to be able to fly to Compton Abbas for a bacon butty on a Sunday morning, perhaps NPPL will be adequate and a bl***y sit cheaper than PPL.
Good luck,
Broomstick.