If Tiagra is good enough for Steven Abraham (and £12.49) it's good enough for me.
I'd just go for the cheapest which is as you said Tiagra.
Make sure your freehub body is steel, otherwise the cassette will dig into the alu body.
@dubtap started
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If Tiagra is good enough for Steven Abraham (and £12.49) it's good enough for me.