Old Ultegra worth it?

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Looking for an 11-23 cassette in 9 speed and 6500 ultegra seems to be only option. Currently using 12-25 Tiagra compact which gives better ratios but miss the 11 cog i had before. The 25 doesnt get used and 23 as good as unused on my commute.
Is the 6500 worth the extra money or am i better just sticking with the Tiagra compromise?
 
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