Probably the best choice
http://www.chainreactioncycles.com/3t-arx-ltd-carbon-road-stem/rp-prod82309
or in similar price range:
http://www.ubyk.co.uk/zipp-sl-sprint-stem/17345
but if was me I'd live without the chubby stem and go with: http://www.chainreactioncycles.com/zipp-service-course-sl-stem/rp-prod65815
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Probably the best choice
http://www.chainreactioncycles.com/3t-arx-ltd-carbon-road-stem/rp-prod82309
or in similar price range:
http://www.ubyk.co.uk/zipp-sl-sprint-stem/17345
but if was me I'd live without the chubby stem and go with:
http://www.chainreactioncycles.com/zipp-service-course-sl-stem/rp-prod65815