I think that the best option is to contact TomTom developers and tell them what phone you have and they will know better which is the best version for you.
Bought version 5.2 TomTom which works fine. I actually bought it for my own Nokia 6680 but installed it onto a friends N70. Got it off Ebay for a few quid! All you need then is a GPS Receiver - circa Ģ45.