Personally don't use heated grips anymore (use heated gloves). My advice would be firstly to avoid the Oxford variety, had them and failed very quickly. Ride magazine amongst others seem to reckon the R&G grips are the best at the moment, available for �35 with free delivery (to UK!) here...

http://www.p-rclothing.com/products/Winter-Warmers/108

I've also used Symtech grip heater pads in the past (which fit under standard grips). Awkward to fit, but when in place I found worked really well, solidly constructed and you can choose what sort of grip to fit over them if you like foam etc. (spare parts are also available for these)

http://www.windingroads.co.uk/shop/p...le-heated-grip

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