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If you are not familiar with Windows based PCs then I would recommend the TomTomGO as this offers a simple and easy to use interface. If you are already familiar with Windows then you might feel comfortable with a Windows Mobile based PocketPC which offers a very famililar experience. Also as you mentioned the PDA route will offer many more features than a dedicated satellite navigation system which you may find useful in the future if not immediatley. If you are still undecided then pop into a store that sells the systems to have a look at the them in person to see if that can help you decide.
Happy new year to you to
