The carbon fiber rims are the lightest/best ones to get if you can afford them, BST is the lightest and Dymag is really close but the Kevlar they added for strength adds that little extra weight. Outside of those I don't know as you would have to see the other manufactures websites to see if the list the weights for their wheels.
When deciding you need to consider the MOI as some rims would be potentially lighter but their MOI may not show it, unfortunately for you the carbon rims have the best MOI numbers.
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If you need a 08-10 750 service manual, I have one for an 08 750.