I should think a couple of hundred quid...resale wise, if the car is in good condition, has service history etc, I don't think cloth will really affect resale especially as coupes get older, have more miles and drop in value
Lack of aircon appears to be more of an issue if people really want it, as it cannot easily be retro fitted, whereas leather seats can.
I personally prefer cloth to the standard slippy, rather unsupportive leather. Recaros are a different matter entirely - they will boost value, even the LE interior

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If you find the perfect car with cloth, go for it - if you desperately want leather, there were several sets of leather fronts for sale
