Can I ask why you picked the garmin units over TomTom?
I' in the market too Nd currently leaning towards a TT 1000/1005 but still undecided people seem to have issues with both TT and Garmin units. Not an easy choice.
In the end I couldnt see a distinct reason to choose either a TT or Garmin unit, both seem to have common issues. I liked the junction view on the Garmin and can see advantages for this, and its a monthly sub so if it doset work can presumably be stopped. Downside the Garmmins have a reputation for being slow to acquire a lock. TT's seem to have better traffic (but less then parfect) and dont have the junction view :-( reputation for faster lock and.
Just ordered a TT 1005 but have to say it was simply because the last unit was a TT. Not really a very good comment on either really, that both seem to have significat issues.