thanks a lot guys

with my driving test just 6 weeks away now and with me having a pathetic sense of direction I am planning to get something along the lines of a PDA/XDA with tom tom, I had allready set my sites on tom tom though I couldnt find any info about subscriptions (Obviously now because there arnt any subscriptions) Ive got a bit of extra cash now since Ive stopped paying for my scooter (Typical just 6 weeks before I get rid of it

) think I might buy the pda or xda wichever I decide and the tom tom reciever and have a play around with it (Maybe use it with my bike) just so im used to it for when I get my car.
As for the choice between pda or xda, I currently have a mobile on contract, if I use my contract sim in an xda could I sell my current handset? This would go towards paying for the xda (Its a Sony Ericsson t610 with carphone warehouse, im about 7 months through my 12 month contract).