Hi Tony,
I'd definately recommend TomTom. We have the Go 910 and are really pleased with it.You are spoilt for choice with the amount of POI's to download. I've downloaded many including all the French aires, the Stelplatz in Germany, Caravan Club sites and also C L's, low bridges and many, many more things!!
You just need to use common sense when using it (if the road looks too narrow-Don't go) and cross check with an atlas when planning your route.