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Any derailleur really, at the moment the Shimano Sora rear is quite cheap in Wiggle. .
Mate it with a 11-32, with the 39t inner I reckon you got enough range, very similar to a typical road bike with a 28t cog and 34t inner.
Can easily be 8 speed with a wide ratios and friction shift (11-28 with 42t chainring).