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You shouldn't need the re-rad antenna for any of the newer models (One, 510, 710, 910) as these have the SirfStarIII chipset, which can see through athermic windscreens.
If you go for one of the last of the 300, 500 or 700 units, then you'll need a re-rad or an external antenna. The official TomTom antenna kit normally costs 50 quid, but Currys are offloading them for a tenner a pop right now if you're lucky enough to find somewhere with some still in stock.
Avoid buying the 'Classic' (now only available second-hand) as you'll have murder getting an antenna kit for this. Also watch out for people selling the 'Classic' as a 'GO 300.' This is (or certainly was) quite a common misrepresentation on
While there are probably better specced units, the TomTom GO is to sat-nav what the genuine iPod is to MP3 players. If it's not out of your budget, then it's probably the one to go for.
Currently in Horatio's garage:
2010 Laguna III Initiale.