SRAM Rear Derailleur - X.0 (2007) or x.9 (2009)?

Hi,
Just a quick one,
Which is the better buy rear derailleur, an X.0 carbon (2007) for £80 delivered or an X.9 (2009) for £50 delivered? Both are medium cage.
Thinking of upgrading from 10 year old XT 8 speed, have spare 2009 X.9 shifters.
Have the 2009 X.0 on my Boardman pro, which is nice - but unsure of the difference above because of the year gap.
Cheers
Just a quick one,
Which is the better buy rear derailleur, an X.0 carbon (2007) for £80 delivered or an X.9 (2009) for £50 delivered? Both are medium cage.
Thinking of upgrading from 10 year old XT 8 speed, have spare 2009 X.9 shifters.
Have the 2009 X.0 on my Boardman pro, which is nice - but unsure of the difference above because of the year gap.
Cheers
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It's mainly the shifters that dictate the feel of the gearshift.
Inbred
Which cables are recommended?