Actually, anything other than last gen 9 speed Tiagra (4500) or Sora, as they have the gear indicators. Also, no 9 speed STIs ever had hidden gear cables, to save you checking [edit: until Sora 3000 - see below]
Just to put it in perspective, this is for a bike I fully anticipate to be stolen.
If I'm honest Im a bit skeptical that there's going to be a huge difference between the last 9 speed DA and the last 9 speed tigra.
For pre-6800 shimano id prefer to have exposed gear cables.
@hugo7 started
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Actually, anything other than last gen 9 speed Tiagra (4500) or Sora, as they have the gear indicators. Also, no 9 speed STIs ever had hidden gear cables, to save you checking [edit: until Sora 3000 - see below]