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If you're buying new, then go for one of the SirfStar III chipset TomTom units. These don't have a problem with the thermal coating. This includes the 510/710/910 models and (I think) the 'One' and the 'Rider.'
If you already have a unit or are buying second-hand, then you may end up with one of the units with the old SirfStar II chipset. This will not be able to see through the windscreen. You have the following options:
1) Use the suction mount on the sunroof. This is how my wife uses my Go 700 in her 2004 Clio and it works fine, though it's not the optimum position for viewing and makes running the power cable a bit awkward.
2) Buy a re-radiating antenna. This will allow you to place the sensing antenna somewhere where it can get a signal and put the re-radiating antenna right next to the TT unit. This should work fine, and will also allow you to use other GPS units in the car if you ever want to.
3) Buy the official TT antenna. This is the best solution from a signal point of view, but makes hiding the mount a bit awkward as it now becomes wired into the car.
Personally, I'd go for one of the new units, as these will also work if you ever want to use them in another car that has a similar windscreen.
Currently in Horatio's garage:
2010 Laguna III Initiale.