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Cheers.
Tiagra is a bit more attractive than Claris I guess, but that SunXCD does look like a really good option... a little pricey so I guess it's time to set up some ebay search notifications. Plus I'm in no rush.
I'm also wondering about just having a look through older 8 speed options, but I'd rather have something with a longer cage just in case, so a lot of the old road stuff is out.
Either try and get a Tiagra derailleur as cheap as possible;
or the SunXCD from Freshtripe;