Rhino are the toughest I've looked at and would have bought them if they had been cheaper, but I have a whole wardrobe of Weatherbeeta rugs (110g, 220g and 300g Jasper rugs and a 360g Belmont) and I love them.
I always go back to it, partly because it fits in the washing machine, and I don't think the horse always likes something up its neck, unles its freezing and windy.
Rhinegold Kentucky full neck is lovely. They're cheap on Ebay too. I hate other Rhinegold stuff but this rug has proved to be very good quality, so cosy, fits well and still looks brand new so wears well.
I also have a FAL stable rug which is very nice but it does rather dwarf my little TB! And even looks too deep on my solid Welsh D. But then again, the rug is too big for them size-wise so that may be the problem! lol. It also still looks brand new eventhough Ive had it about 8 years now!